Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7613fb6915f6b14…

MALICIOUS

PDF

80.5 KB Created: 2021-07-24 21:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e36523707c44e304fe8ffa5dd7e803d SHA-1: bbcb67c43d33ea4ea70eafa46b6dedb0e4af7f9e SHA-256: d7613fb6915f6b14a77537363eb7502ab17e273e8f6c9a780e771bb9c81ae265
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a88dd42d2---puzufitidugobabitewujen.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095463140f50---vamuteba.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e5a39af2e4c430ae8b7ae22b5c95961d/dofokagakotapolosadizubi.pdf
    • http://yuc-fac.com/uploadfiles/20210724142347.pdf
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/55312655096.pdf
    • http://sola-brothers.com/userfiles/file/medaximalijagiso.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/86879878144.pdf
    • http://studio-castiglioni.com/userfiles/files/xubebiviminewuredorura.pdf
    • http://yachtandgulet.com/userfiles/file/jumujezugosu.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082770291eb9---zolironuzaj.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/b40e8aff298a1d07d924cacdd5cfd500/43882374690.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777a0b6157d---96835776090.pdf
    • https://przyklejki.pl/userfiles/19389845018.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d53e4b2f495---jolakewotevubabobi.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b1dda3218965144aeb9aa849486c9d00/nagefat.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1fe9ef02---xuwifepirivubupozexug.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae848d248cc---filevadomizixiban.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/31172305862.pdf
    • http://honyi.tw/ckfinder/userfiles/file/93133450041.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/76275578972.pdf
    • http://yacpa.org/yacpafiles/file/xoduta.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b74a6acafdbf851832b8e70618579ec2/41719873665.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/eacf00667c58289d8992e07de10cc69e/93091844421.pdf
    • https://fcksa.com/ckfinder/userfiles/files/visafivekuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=graco+story+convertible+crib+instructions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d63c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 16792 bytes
font_01_sfnt_off0000ee53.bin
b4fdd55a782f7948285f9875f2a8b2a29e27be1cc69323b9dc128a20755ac56d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 10680 bytes
font_02_sfnt_off00010708.bin
74cd40ff1170388f4210e88b1616032a4954e014beca258f563ba408d8228b35
pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 17212 bytes