Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ad42e70ac708c5…

MALICIOUS

PDF

88.4 KB Created: 2021-09-05 03:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b865caf58a569b42d80cd9cb5dd270a SHA-1: c7a76404ce4c2316c88f0c744d1f0c9f01fe307c SHA-256: 49ad42e70ac708c5d8801b7336d7239ec8b6c3ad87e2aff48964264499b6cff2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=berliner+platz+1+intensivtrainer+pdf PDF link annotation
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/25755279387.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fa7733a42f712d43d3f4b2346c99739b/72538910914.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/rojukulolusexo.pdfIn PDF document text
    • https://daismene.it/file/pokama.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e421d66595---tokok.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/ttnl3qr9ko6l0jkpl5d6cnaqj4/mizolizewaluxapijoxaz.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6875e76b1b---kolenotuwo.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/dutex.pdfIn PDF document text
    • https://bdata.vn/upload/files/35304840270.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94c9c2f8c---44489066709.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7924ce8a1---45517872788.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/kijud.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/bafotuxogutud.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/75133044476.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/bulirovetomefew.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b650730711---7537354894.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/76814ca4c5ac510bf138f5d746c55de9/73708950437.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3e3af1894---20775583686.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/72413986320.pdfIn PDF document text
    • http://fittbike.hu/files/file/14724704166.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/106468954.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/kawiri.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6iiqck4n9u71jmlfnhq0bviei6/jugilozasif.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/k0k13hemmmrfhk71e5pp50ef7n/tawisidexuviju.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/zikog.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_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 23056 bytes
SHA-256: 029b47e707e5074b3ee529b4cb94d7cf266c49631585e5a4318aa1bb83946c2f
font_01_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 10600 bytes
SHA-256: cbf56c894c18144525bff7bec232abdc3dbf917eedcfbd6e0e54119ca8a4d3e4
font_02_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1