Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee55354ba4d07854…

MALICIOUS

PDF

69.8 KB Created: 2021-09-11 21:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f754bef54eb34c7fa2e86470060635cc SHA-1: 5bac5662df2c6a87f3ad9cd8cecda1e63c41a7fc SHA-256: ee55354ba4d07854e72decde9a22f3d3ff93b5af1d759afb58b0d33a018fa047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, including one with a 'utm_term' parameter suggesting a phishing or malware distribution campaign. The presence of compromised CMS upload links further supports this. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=cooking+fever+game+mod+apk PDF link annotation
    • http://pkpneu.cz/userfiles/file/femefe.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210911091800_1483677916.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/24751247909.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/46020714045.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/48103942567.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/gibudumebizezimudeb.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/duzixupabuvadutatavazekod.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/wemuvapeluvexodo.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/25611075256.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f9481454895bf4ee222057fad6cd8471/sixebejowisaji.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/navano.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/timufosuwebosupoz.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e990cb47---zukizasejupeferizunat.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/moluradijugumivena.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/babupam.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9s53ilq8jtqddqvbqo9j7javr7/17008886347.pdfIn PDF document text
    • http://rs-entp.com/upload/file/18776664683.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a491441c35---bebizufexilomuvi.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/arodokobinun.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/46659316595.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/74873ddff52cb34b067743af99917a0d/vesix.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/gavawekuraveligimomebepa.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135088586781---91687162047.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_off0000b3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CC 14736 bytes
SHA-256: 870aee82fed0f00708f1842f2a85fcc97e17d4e2f7d946f676fd1e0071c62a30
font_01_sfnt_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 10720 bytes
SHA-256: b6d1be0b41fe8d1fcbf3e3768a36316224d5c5bb67a0667205b558df180eb8a6
font_02_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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