Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37e357d3f5c3ce2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 23:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36658807fa651e29e8e17a9f6a2d74d0 SHA-1: dae22db2bf695a08d1e452dd14fde06925244b42 SHA-256: f37e357d3f5c3ce25498a183e41fb8b0b062d999e89dbdc42bd7772344e9aa25
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The PDF_RANDOM_URL_LINK heuristic further suggests malicious intent by pointing to an algorithmically generated URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=snapme+app+download
    • http://nelly-design.ru/upload/files/jezoritaruzoxor.pdf
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/fululomisajibut.pdf
    • https://peusch.lu/userfiles/files/fefatataro.pdf
    • http://01host.ru/userfiles/files/nabotezuwuvapojex.pdf
    • http://ldksolar-officialliquidation.com/userfiles/files/3328854940.pdf
    • https://kerryparsonsfoundation.org/media/file/13711386186.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3021f631---tedaronenesak.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/75682844332.pdf
    • http://sanraimundo.cl/dyn/uploads/file/31556944652.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f5ccd4a2ba7fdf2a50da0458f999e6e5/wedodumamizelep.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3b9d9bee652c207895676dc4373953c9/kemajizizunelenozinimema.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/77283624061.pdf
    • http://babywagen24.de/userfiles/file/ruxovete.pdf
    • http://immobilieninvestors.de/userfiles/file/91714340924.pdf
    • http://homeopathyhongkong.cn/files/dajigi.pdf
    • http://abwingsde.com/uploads/files/dutulu.pdf
    • http://clinicaveterinariacittadivignola.com/userfiles/files/19977499994.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/kulekisarazew.pdf
    • http://unitez.net/images/newtech/files/jopagisipaxogoterikev.pdf
    • http://vimbark.sk/editor_uploads/files/77383945557.pdf
    • http://dzirerealtors.com/uploads/5685240693.pdf
    • https://szallas-karpatalja.com/upload/52984810830.pdf
    • http://brandorbit.in/userfiles/file/somevike.pdf
    • https://bvphcn.bdata.vn/upload/files/49109249866.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d3100ee4---wikezavarokalazesodafiz.pdf
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/52455485376.pdf
    • 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_off0000b433.bin
3abfe09a35f0daa68b5b9f8c6272b3f1656d5bc0712e40e5ba7319d9d5d01400
pdf-font-stream PDF embedded font (sfnt) at offset 0xB433 16620 bytes
font_01_sfnt_off0000de44.bin
493864dc98a162040ecf621eb15c7acaf37ecfd2d920492b05a4701c8c9753ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 10256 bytes
font_02_sfnt_off0000f557.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 16792 bytes