Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f4960e34cf4041…

MALICIOUS

PDF

79.6 KB Created: 2021-07-02 06:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70531c53db710fb7b3a007c3b9e1f3bf SHA-1: 04c3b34947e457d856ead256a7b8fb872d164219 SHA-256: 05f4960e34cf4041da4f4917ec04e0103c6e6a01e32d6fada7f6184d7993f473
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on compromised WordPress sites or disposable domains. This suggests the document is designed to redirect users to malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=circumference+of+a+circle+worksheets+with+answers
    • http://www.vljainandco.com/userfiles/files/radabo.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16075e789084fb---kibopomapodazemedi.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b9db0136fc816a9d394e86a61a1dc366/wadatepiz.pdf
    • http://decalvanphong.com/img_duhoc/files/vasotaxixavuduxevipokubof.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160aa505f4f13f---51949993884.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840af93a80e---koxapoxatozerodasenaguwav.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0fb04c3d---88125466093.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ff2329737e0b7132d591dde188dec77b/busuwikitar.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/ditezeb.pdf
    • http://mtsskzy.com/userfiles/file/86611618442.pdf
    • https://akita-inu.lv/www/files/files/zagegufe.pdf
    • http://anvlaw.com/userfiles/file/69464249148.pdf
    • http://wagnerpc.com/userfiles/files/zibidalidufo.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/14544548771.pdf
    • http://deurenhanger.nl/userfiles/file/84434873200.pdf
    • https://chemasan.lu/userfiles/files/60246225277.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/d7ko1bcp3gp18t4ofvomqvd3pj/75158788804.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0ce1becc4805c580334c4bb8fd2c72ce/76924758645.pdf
    • https://pottoka.info/files/galeria/files/basofafigobu.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0c784835163e90dc67b1e421da1c38dc/texumoriganorazixob.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/48229555730.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7d477b76a2082f9c8a5a0cbe3f606824/rekodaletituxasevodoxu.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a73b8a7c8c---fateduxireka.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/aiq46vv3sanqd0v5h2v1v6jfg2/61644177440.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1188bcedf8---wufufanazapujujexupi.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/gavoratavu.pdf
    • 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_off0000d26f.bin
b3bfae4cc8e542a1355007ec6d66ec1d278eb2c6e3e1ff6a5dc460db12e65a4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD26F 10908 bytes
font_01_sfnt_off0000eb94.bin
78a00e99d05a1b0294d48d367b600795a96e3c70979b65cbc42da8dfe853783f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 17232 bytes
font_02_sfnt_off00011892.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11892 16792 bytes