Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2b66c334594b04…

MALICIOUS

PDF

104.7 KB Created: 2021-07-01 18:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03516ae0e76f16d90efbc30fe6e607de SHA-1: ea38d1b82e3d335239ce2866fc0d2893408774e9 SHA-256: 5d2b66c334594b042d11ab58aa4da966590ec3fd74e7e0f1618b6d1bb1e53ac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://home18.ru/wp-content/plugins/super-forms/uploads/php/files/7ba74847c01aaf5bba7d789f4da02686/wodisemosajafapinekexawa.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fa2aae683---39611961639.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/jc68benpbggqk0u652oodcftk8/xuruvo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c7e61bdb8df34225025b29dc37d453d9/falukizegi.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/29796911703.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/80258385209.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/nobeflsi3n7scovii9sq2veis3/foluxerezuzoxenatulosixu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad0d9a25a---navaxujipeziwolegaxonadox.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/f3f7699fd1716343b792e1c57e26acef/73442632424.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d366aa89c946515a90ff93b4f32db4a2/bemuzusejutenawoxamap.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb0278d133---64872165297.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/30143874762.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/54812086720.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/xazifop.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/vowezisapexon.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160965563788c5---94045969422.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/6413bb3ed87f85003947b5e4407153b9/vobokevovokepipomigoxo.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ad38282b6---zajamixiwel.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d869f2cf0ed---54663542512.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/fosojijuzepufu.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/31f8b82c7886a280c72f58c160a89d9d/4943402125.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/50333f909eae50a7f2f8418bdc9c6a05/pezemuv.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/7j55rmo09apmv18rpntt7cub74/19828064801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=take+over+byPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CE 16920 bytes
SHA-256: 61c7f8f34acd7dba454b24b9e51ccbf694dcc66d9e7940720f31925e0219a79f
font_02_sfnt_off0001605b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1605B 9968 bytes
SHA-256: 5ac63dc9eb21741b753389cb28318aea0c1ec8d1cf0c3dbd2fed634d75c258d8
font_03_sfnt_off00017699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17699 18760 bytes
SHA-256: b2906f57e4e3561ba6f592f21bbf0ae7fb8ee1aadc6bbc954022514f4bd798e6

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