Malicious PDF — malware analysis report

Static analysis result for SHA-256 edafb954916a3191…

MALICIOUS

PDF

104.3 KB Created: 2021-09-04 09:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6effa0d45efe81eee0263cf669273626 SHA-1: 5bd1cc194bcaf0690c4e1e6a13f695ea7b44a469 SHA-256: edafb954916a319122115ef81eafe1accefa0fa77c146595bf6e9157613fae84
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits multiple indicators of malicious intent, including links to algorithmically generated URLs and compromised CMS upload storage, suggesting it's part of a phishing or malware distribution campaign. The presence of numerous external URIs and the ML classifier's high confidence score further support this assessment. The document's structure and embedded links are designed to trick users into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://infrive.ru/uplcv?utm_term=general+mathematics+10th+class+book+pdf PDF link annotation
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/43346813619.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/xuxuxutarelogunijagavula.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc00567edd---ratajarudifimadepufiva.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d0f68398dba1453c68ea14b01570e333/43328886470.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/7525285928.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f569bc22f---tinojoxez.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/wuwina.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/midasekikitizapogawa.pdfIn PDF document text
    • http://gojjang.com/uploads/files/sosatedonap.pdfIn PDF document text
    • http://abwessex.com/uploads/files/sijilajigisasaxoruvage.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/72990864841.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607866d5e68b6---93072887002.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/c50bed41d15797491792564dd7864a1e/18521264769.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aadcc0256---22523319458.pdfIn PDF document text
    • http://nessium.net/userfiles/file/8612627978.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ea9f0569a5fb4852e548e03482779ee8/86451125935.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c632324a6c---34646933516.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/34291427521.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846d53087a1---gifav.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vupidew.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/pemepib.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a2058a1f2---92069002998.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/n1h1elgl2gggmns6et26mgb4nv/bagulifufedamonore.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_off00012cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBC 20560 bytes
SHA-256: 0e3b12993529c05dfa478aa2dce4306231c2e179a21d4a866a61fd067a0986b2
font_01_sfnt_off000160d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D0 11332 bytes
SHA-256: af56fb87fc2a2311b28e820357e0e7200f947d99663110337a8479b00051398f
font_02_sfnt_off00017b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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