Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c30ed84f8777684…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 08:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1693c1310eaf8d1b98dea8fa09dab0c2 SHA-1: 60963551b285fe396773faac5c1ded6ea23f68ab SHA-256: 5c30ed84f87776845cbd80ab4955dc3f2db5c57cf4eb8e0c4b8d911d4efd3aa2
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. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The presence of numerous links, including one with a 'utm_term' parameter suggesting a lure, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://pistant.ru/uplcv?utm_term=the+lion+king+2019+movie+stream PDF link annotation
    • http://meijialx.com/ckfinder/userfiles/files/memedab.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/salupokelilud.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/zirumovefinas.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/gufamek.pdfIn PDF document text
    • http://bubb.cn/up_file/file/21688980186.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/nj95gp9i2tefs2l7fnnnffbt2d/69915596305.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0dae429e2f1c363b0c21a27eb395ca3c/85852475223.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qsv17athsugilubpf03l61km1l/kelarudu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bf7d4e2dde733a40e456a0f8d8ad6abe/71344387191.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/xipinon.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/tamisisoriv.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/danebinewivimunokepiri.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/93281450191.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147bae3701d6---8368801945.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/maxakilidujiden.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/misozobabugavaxadulevime.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c55b4d82a---lesuvetukupodubufu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d74d85a109eab51e11de16b0bf4ff409/witige.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/43787613505.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/wimilasezeliwotabevukurux.pdfIn PDF document text
    • http://wjcopy.com/upload/files/17689660579.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/ferakuwijipotefop.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/13598819152.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bd9235bc5d3024cfb7d4aa2e1d752a62/28384074550.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/damonodo.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/74496030062.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_off0000b4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 15152 bytes
SHA-256: e294cf1b5a34ab6e400f9e626bb49ed4a8333f1022e409c678934124cd617573
font_01_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 11136 bytes
SHA-256: 7ba4bd879c9310493f8ee0fdf10273a7bef538b7aaaeff2e115d520e72200bb4

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