Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2a9991852d537d…

MALICIOUS

PDF

86.7 KB Created: 2021-07-09 23:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7a614a739a2f24c55a577ae6a0ae3ff1 SHA-1: 16903bda2e82f55ce89f25f137b4269af3cc90f8 SHA-256: 5f2a9991852d537d9396bd7b926145bf1038068d4b461e2c9521611cb9c1603e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate malformed streams and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting the PDF acts as a lure to external sites. The presence of embedded URLs and the nature of the heuristics suggest it is likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=join+pdf+download PDF link annotation
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/gn83s5riv1tv036sau0h2o3r8g/43074930019.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/debe1e2e8fac755fd1a6416616a018e0/8248294831.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t2ulgf424dv79k3nkp6bki0bl6/jovogaxugalozefonedibuz.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0adrh8fbeokh7euibcj51rqfh2/nixejiki.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/gapejogumeradire.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/gevofugakolevo.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/5f45b145bed88a3b1d095a3a7a35e1d2/16130673300.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b89765afc50343dc02f6f9fb169c07e0/52296465685.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae831fae6dd---gipafogisidevatamonarakop.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096540d35db7---zewuzonuz.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae3ba5b591---33509766991.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9f48bee8bb76cc1192a0cf817f4545ad/bizezopumavonogidovi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d6c900e27---52610469554.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/88bbe971fd58d3d6e0f49e92f388e657/10739220471.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/tijujikelusip.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/27726762587.pdfIn PDF document text
    • https://premium-house.uz/images/file/firadoxasebizo.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c63d7951606---kepiwilobobatasujaxu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608064ee81fb9---44821112048.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73b6d3fe2b---96911586935.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b882763b35e7758243a345a7575b88d3/49534600565.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/ketate.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/lidix.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/82071705823.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed21bf1df---17953783982.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845395e9c6b---vuvazop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 17236 bytes
SHA-256: 9d1859a18c0aaf3086d95caa4ff4bc2d03e6fda656b7ec844f063ee23aa6dba7
font_01_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 10072 bytes
SHA-256: 42d7fc7a1f2f3337b2dbe7a4f613968c5a64e95b6b68d391e2ba29c9bd6362e5
font_02_sfnt_off00013588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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