Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef996a4012c3fe6…

MALICIOUS

PDF

81.6 KB Created: 2021-07-07 01:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e523478e6f65978d77b1e65d13ea8c6d SHA-1: 77432230996128c1369095f40b77f5b3260261f6 SHA-256: 8ef996a4012c3fe61a7afe0efb25c09253601e09acda4e4fb625ad6509903653
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an effort to obscure the ultimate malicious destination. No scripts were extracted, but the structure and heuristics strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9l3sgmfpqhf6ock3922q27d6s7/fugijade.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/79621262520.pdfIn PDF document text
    • http://tencanpowder.com/d/files/52534507165.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf0b31319---boxulisiditi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/duwomatisisexil.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/sagizugovu.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/81446102419.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621224937.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909e3c4ae54---34175341834.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/mupolaxedapozoxatipuzed.pdfIn PDF document text
    • http://mesterek.net/tmp/naxipuxogafebinogugunese.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/kiwivisovalubemone.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gr2dnga3q2sebnvcnilouktouh/1870933988.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b9511661bf2---fifaroxosizedabomib.pdfIn PDF document text
    • https://actor-conseil.com/files/file/33239527404.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af5736e9ba9---fepuvezaxida.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/94894725025.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/75b604c6a6d1b66d6e688cc7ad00ce1b/vorenabewosamovo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd357f4163---bogani.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/eb8d8db2a9791c64463848309ea36f73/49688719445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+wether+forcastPDF link annotation
    • 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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 10240 bytes
SHA-256: 75627031321b2a2a9f863be15ea482539791e171037ca6cd781d163ffa700c39
font_01_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 18372 bytes
SHA-256: 8ae532e1a1f707b04604fe4a22154123c93c70e8d215eeb3c8413ca53009b3b7
font_02_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1