Malicious PDF — malware analysis report

Static analysis result for SHA-256 8180d36ad6371167…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 11:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb1ba4651d626a182df184315e12d4d2 SHA-1: 36f9175dfd7a10225c13917ce44a892f9f848ff6 SHA-256: 8180d36ad63711679aaa3f42627094abe716b50fea6718a412675269f8965c55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=business+ethics+william+shaw+9th+edition+pdf PDF link annotation
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/14368947985.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/84126722471.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/20017671226.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/tofopakip.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/xufanofisegiladewef.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141504b208e1---5525566442.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/36596434863.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/foderitaj.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/51414628508.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c22d07236fe67cc943736cd3a26cfa87/lilupenonawovonule.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/ralirinivazo.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/kixabutolenap.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/btcs2m4rjkfqcarmoao0daaki0/10063459129.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/3057746563.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc07975a81---44650476094.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/65585082333.pdfIn PDF document text
    • http://cx-gl.hu/images/files/rerisomabidanu.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/resezususifegan.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/diletemuvawikoporawi.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/12345224702.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///mirux.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/97118245044.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_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 17272 bytes
SHA-256: d33ddb60526666aa087a7de9191ac5208614f3f8fde77dc238538482e2ac8950
font_01_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 11192 bytes
SHA-256: a51a4d1a4dce20221e3fc4c409af2cbaad0b01de2f77cd375380b9d9fa0fc5e2

Open this report in the interactive analyzer, or submit your own file for analysis.