Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff0427114bb27a0…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 03:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50f8ec9363018cbfc429eb6f935adeb9 SHA-1: 581e05ba9854163504d698c525a7704d0a7d7f42 SHA-256: 1ff0427114bb27a0eb5985b8d92d534417498ad5029d29ddc9a63ba5a060955c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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 http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/98645242234.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/73deebedba081dc5a9c94b3ab4408eb7/gofotesozenudemanixuxugek.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/xobetogonim.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/67aa8a3dff59fe24e464c962853ebfc1/wikob.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2207831ac6---83974176749.pdfIn PDF document text
    • http://technocom.pl/editor/file/relozudugerutelepifabim.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/f65ugq7bb2gfkqe445rf24f91e/69310529045.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/99092869087.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/vozadol.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/wovanikidufudofigubuvaj.pdfIn PDF document text
    • https://cristalensi.com/public/File/67290277372.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/27363110710.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/gudogiredutinagoridubuwa.pdfIn PDF document text
    • http://bdn10.cz/files/file/lutibesoruxetivozisujog.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/favozu.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/warutegimofifodoxusof.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/18e95351fdaa170eaf71010acce803b3/69764313405.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/varumotarefako.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4ce495715dbde48eb774888824993b51/jufabevuvamutesajuwajo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qrdp242vviq9ct6b2d7nlc1eo2/dinem.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/42338716236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=lapp+insulator+catalogue+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47D 10852 bytes
SHA-256: d2b4b9b17e71057137db9b6ab94db418612508dbc9bfff4a4f65e66c1481d1ed
font_02_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 18048 bytes
SHA-256: 6d4bf0c641c4ebf4b23ee2909e6f5a5cf4aca1680657cdd5b219d60e357fb9b7

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