Malicious PDF — malware analysis report

Static analysis result for SHA-256 488154bcabfbe8f7…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 05:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d9fba4a02f828e66ed608f945ce9635 SHA-1: 88436660265846f958e8bdaa47a4f4ffbfeca424 SHA-256: 488154bcabfbe8f7672ba31db413c98abea18a5a3f6fb391e0b6c05fe2dcb073
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a payment redirection lure and a link farm, suggesting it's designed to trick users into clicking malicious links. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious intent, likely to deliver a second-stage payload or phish for credentials. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://cutskytools.com/d/files/21741081869.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/jevulegenomazifeku.pdf
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/33927961714.pdf
    • https://novinfasteners.com/userfiles/file/28568293603.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e96d80f0223b745887f64bf734fef82f/63556811985.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/pivoxorepimotogujareju.pdf
    • http://markasib.ru/ckfinder/userfiles/files/58899679335.pdf
    • https://aprilboya.com/userfiles/file/lezijavuguludawores.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/48234923747.pdf
    • https://haidangpc.com/contents/files/mefogapejejazurag.pdf
    • https://estoniapools.com/contents//files/sasaliwudadotopaj.pdf
    • http://perlawarmii.pl/userfiles/file/tuwolovobisujaxijetoxep.pdf
    • https://najlepsze-w-polsce.pl/uploads/65178889499.pdf
    • https://csp-pub.com/stockages/files/zurakamurilasew.pdf
    • http://autofulltravel.com/userfiles/files/bazaxonerug.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/0ii2s12pjsamrf7uhgh5uarcr3/75053236337.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fac29c982---24867321882.pdf
    • https://nasikampung.info/contents//files/tuwav.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/zusamiwixifejire.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05350c3b83---79782116876.pdf
    • http://whkmradio.com/userfiles/file/64262720642.pdf
    • http://homelife-superstars.com/image/files/pifadatabuxanagixatudag.pdf
    • http://www.allatpatikapecs.hu/images/file/rikeb.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfb8e131c---nekimatosiwufusetiziso.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=myob+accountright+training+manual
    • 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_off0000cf84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF84 16792 bytes
font_01_sfnt_off0000e796.bin
43cbfe66eacc091afbbef952fe25e2a0ab1998f6643f9a304a50c706587a0ba4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 17184 bytes
font_02_sfnt_off000113cb.bin
9ecc1ac9dd04a245a6664258bff38e866db76d1eda6db90f0051c45739db0c13
pdf-font-stream PDF embedded font (sfnt) at offset 0x113CB 10724 bytes