Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc107099ecf7d115…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 21:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5a0e34d7c771a6f38b5c492d664b1228 SHA-1: 71544189a16cdfd4423ed79cade2bb87d0616715 SHA-256: bc107099ecf7d1156258c6965741f28ad5772d2ebf42ad3ab8ce97d7d7890cb0
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://lyonsinn.com/nbloom/fckuploads/file/wivujanetezajovagopaset.pdf In PDF document text
    • https://inmaabiladi.com/userfiles/files/31735960273.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/77397415543.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/27513017059.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/digugovejulifiluvomomilob.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/44868944439.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b098f870---ginepanilebizag.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161568d70ed300---61151026506.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nujakesodo.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///98477932967.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/wogijafab.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/dejediwusiwedin.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/49864092236.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16157fc5c5bba3---bowagodugaxupasavufiko.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/jemavawukavisesuka.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138434901914---19876770669.pdfIn PDF document text
    • http://juncheng.tw/upload/files/ganonaxirivud.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2e232ddf---tepuxejedoli.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/rutijalawu.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/40070835535.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/zosesaxu.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/lizixilubuna.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/45758291578.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94120995135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+breed+trox+on+my+singing+monstersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F3 15432 bytes
SHA-256: 117ecc4d79067c900b80a2cb59806589a46cbdc485bfd231e5fac113f9544048
font_01_sfnt_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 10816 bytes
SHA-256: c17e42434af84ba8b0dafd0e3539bc13b4f1d83ae5541c79660890c12e21b271