Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4d3e4559f5f86b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 10:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23ad0be12d4daf481cb30fec948684aa SHA-1: 7597740452c7e557e05c2491868c28895f8f2c11 SHA-256: df4d3e4559f5f86b1e09dfc8627b3e2e5aa5331afa113de9e03fcbde824745f8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and a machine learning classifier, with high-severity heuristics indicating the presence of random and compromised CMS upload links. These links likely lead to further malicious content or phishing sites, suggesting a spearphishing attachment attack vector. No scripts were extracted, but the PDF structure itself contains numerous external URIs pointing to potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c194b387e---kikojosubagobolivaxeli.pdf In PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/tavowuxosolusafobenobadav.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210628_03437B25CA18F55C.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/55288310116.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/67268140037.pdfIn PDF document text
    • http://thedreams.cz/files/sevabadajarowuwezijibut.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddc3e29759---xagovi.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/jutogez.pdfIn PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/sebafib.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace8db18d12---waxuzatutiwom.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/40720646276.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c778c556bac2175e1e11980479e7da39/62752302996.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/40623239176.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1ac75a59---rutanedilusudubosusetuxu.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/walaxanel.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612384326b3ea---tovinub.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c153812aab1---60574180652.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ogv4fsi6n18crucgb4se3lb1ct/tofunugegupij.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/fukijimenigopavi.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/30169202029.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a133ba887e9---duwabegofiki.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/58350069200.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0f746f6ee67ec36cc5f923217c04e3af/70108850856.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/h36pqvsgn5d2u9k7c992vdlgqd/86174411134.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/308cca6d66a0c0003b440b733017511b/17715459449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=self+evaluation+examples+for+new+employeePDF 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_off0000c5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 11064 bytes
SHA-256: b832eaae04878cda2e3390bd5ae3bb62d13900d3bf817a4ee6a80c9fc56de94a
font_01_sfnt_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 15672 bytes
SHA-256: 29995130126a5ae54807c9ce5b412d5acb3adafdf557dad30f14551ae4589f0e
font_02_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.