Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb76f35ddcfcc26…

MALICIOUS

PDF

101.9 KB Created: 2021-07-01 11:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99e44f4e5da1260d47a5ec8e894f18f9 SHA-1: 3da4a2adee52bb17338783ed29022e8f513df9e5 SHA-256: bdb76f35ddcfcc26563ad9c21e7e49642a4e13bd84981b631b5c0372bba9ce7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware delivery. No scripts were extracted, but the structure strongly suggests a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://vizit-k.net/uploads/editor/files/64310148066.pdf
    • https://dalilak1.com/userfiles/file/56707547285.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4f46f544f0fe0d13189c328242b87025/18372700746.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b487dea8a0c---48118741942.pdf
    • http://drentmedischadvies.nl/uploads/files/lebexufudig.pdf
    • http://beijinghuojia.cn/userfiles/file/naroxelatomapujamu.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/4cad71t5qkoik76b31m00im9et/rilali.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc20b7564b---vagajefugawurunopiposedu.pdf
    • http://singlesync.com/userfiles/file/95390013083.pdf
    • http://arniestribu.com/campannas/file/65927053285.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d24c54c0520---dibada.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/e06apa46nhko5nrqi6dvugjtgv/wanunadabavosebu.pdf
    • http://vivo-mebel.ru/upload/file/xisepopejulotosetunaluxo.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf24e05242---sirolosorixezufutifowofo.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6157021b3---temijusemoxalalevanodufud.pdf
    • http://tortsurprise.ru/upload/redactor/files/97962009584.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/vimuludepedored.pdf
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/38481156554.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090dbe645e1c---silotejapulazis.pdf
    • https://collegemahan.ir/basefile/collegemahanir/files/fugevozegigobe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=use+emphasis+in+a+sentence
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132e9.bin
9359908bb4e1fbd22867e5d4cc77a8fea276303ae591f03e020f176ce3d01acf
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 10380 bytes
font_01_sfnt_off00014a3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3B 16792 bytes
font_02_sfnt_off0001624d.bin
7ad690a885b2e7b58b5270b628e7ef8e96ac90fd56bed243b0ed781747a9c677
pdf-font-stream PDF embedded font (sfnt) at offset 0x1624D 15772 bytes