Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a3de771237877d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 05:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 686ec33366fde82d379a130ea09f0167 SHA-1: ef9023f39d57cbedd1fa8e990b2cda8c89b356e8 SHA-256: 83a3de771237877d253201a6e8a8da093fe64fb00a3cf73d041e5fd1c35bee4e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One heuristic specifically flags a link to a compromised WordPress upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://doluhosting.com/calisma2/files/uploads/dizasod.pdf In PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/94662592522.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/82958649378.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ad02c51dc92---mokefepuku.pdfIn PDF document text
    • http://topstec.com/d/files/46144937395.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/pasubawiloxinonak.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/suzutumojimuxanad.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70e228f91---xojanekigoxo.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/1552275223.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/wapepurujibupukafex.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210624201845.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/bepulok.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e56ecbe024fa261bb1f6a51f9b8c5929/22353892835.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/40648377987.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcdd6301ea---jutozimunipiraremevur.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/92772779830.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/dezibubopanozatat.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc557e11b2---12092041543.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/vbmg1ubprv1h063mmr1g6vi2i2/netivini.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b284c8c7---wixamexawanomitaperil.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/697hmvmh3mi3348vpiutl6cc6m/refaxaso.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210817121016.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/80342845889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=this+month+current+affairs+pdfPDF 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_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 10904 bytes
SHA-256: ae922264a8e5a71e61f80f9687ee18cb0a5f596631e30e7427d8efb6ccfd3fff
font_01_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 17664 bytes
SHA-256: 2f5b9bd36de1e6e2576aa33fb53128f33d814d0a0149a97f48f443ca2f24d511
font_02_sfnt_off00012a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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