Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97f3f1dea37facd…

MALICIOUS

PDF

72.9 KB Created: 2021-09-12 10:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c71384b838365150c904edd899b2fdcc SHA-1: 6db681895a1f5c5d850ae87654bd7a44765ced2c SHA-256: d97f3f1dea37facd19cc9d1caffce4d1a3912c550ce3b14231fcaa755d33ba2a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of a QR code lure heuristic further suggests a phishing or social engineering attempt. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=qr+code+generator+c%23 PDF link annotation
    • https://zapcdn.space/web/img/podborky/files/binumu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7f13b840---50384439297.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/tugilomuzegen.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/ranufo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613333569b2a3---30164673039.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/bipodokuwetasuniju.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dad8067ce---wusabo.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/batapesesov.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/kegokirevupoxewobapexoz.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/xurekewufaxobab.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/ditozojobokanog.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/4865239639.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/bobupilexogejamofu.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/58527634330.pdfIn PDF document text
    • http://sushi-belovo.ru/files/51306570881.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d604a991---suxozogodi.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/43007088242.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/xewefazawilogaxed.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210901_5B0BB4A60C741B60.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/sezegizido.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea4518029---38587379488.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/zezozejezopezub.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/3260897310.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_off0000bba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B8 16884 bytes
SHA-256: b3e4e2ee7512f5dc6f28cda02986deac71824cbb99e9f6bf55700eb7be8d24c7
font_02_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 10300 bytes
SHA-256: a0c972124af7774836b31fb7c7a08b09f7616d1fa81d549b3b1856e264da0d59

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