Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59f54ce0f42d4cc…

MALICIOUS

PDF

102.6 KB Created: 2021-07-23 02:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b8ab45c83e7e651bd99a878e84a69ae SHA-1: 140fd8a9e0230608e92c028a5dabd58cd813343e SHA-256: c59f54ce0f42d4ccdf9e7c0b5af1e222aa5afb02465237f19660520b41b97c03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, likely to lure users into clicking through to malicious content. While no scripts were explicitly extracted, the nature of link farms and compromised uploads suggests potential for JavaScript execution or further redirection to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/42606327902.pdf
    • http://logistra.fr/ressource/site-image/files/2028700281.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88094524846.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd420643f7---52540277273.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c4d75f84f0ac17623f105b9e53585cdc/xegomodanunutorajuvibe.pdf
    • http://csc0351.com/userfiles/file/20210614151602_4goch4.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c4fecdd7e73a112e68f98387d03fa0b6/20511492239.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/91dd315d243dc66ceace8c0a6e4b61cc/99988410301.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a53691a7407---mosapozazalalogezirejifu.pdf
    • http://nyitotthaz.hu/userfiles/files/lebup.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/fcafde50d4b8ef80378dff5f7c9030d0/66789245227.pdf
    • http://dichvuwebsites.com/media/ftp/file/7357375021.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608049b6651f6---47325551170.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607860d81012c---47389941771.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7f69df95f694a0f75d156546512230b2/vobebezarexupalasu.pdf
    • https://projetovm.com/uploads/files/xijukipuludafapedujatowu.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a881e9a93db---13800169775.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8576567276---92890975106.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/61028787669.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/gowuvewifirasiwub.pdf
    • https://ludifrance.fr/userfiles/file/22361861231.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91f2747cf5---jivapesekipupukogiruf.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/b708e11ef51be8d77c27dbd93c3529ef/84025724794.pdf
    • http://guojingmall.com/userfiles/file///muret.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=1+rupee+in+us
    • 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_off00012d08.bin
915feea5949b5e44cb5c5f026a9cf4b6b277a0ef98a5e02664f108beb433551d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D08 9876 bytes
font_01_sfnt_off000142da.bin
a68141cf0360937f62c00d5748e4ad245006d3958e42c9fb9727245afa75642b
pdf-font-stream PDF embedded font (sfnt) at offset 0x142DA 19208 bytes
font_02_sfnt_off00017451.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17451 16792 bytes