Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f07b03acf12d1a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 09:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 718025e6b6cce90445c6f18944d1522c SHA-1: 500fbc4fb303a73c645bc1fee423860589fb7d29 SHA-256: 76f07b03acf12d1a15adaa0266a83eac37e679f6164171f7339907f3c0cc7922
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://imoroz.by/upload/file/95271083617.pdf In PDF document text
    • https://nhachoxebus.com/upload/fck/file/nomujazi.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/37269318503.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/nowejujopepaxa.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/23045619523.pdfIn PDF document text
    • http://soles2walk.cz/data/file/lorumubiraza.pdfIn PDF document text
    • http://novichiha.ru/pic/file/68052254179.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3eb0457ec3af00f23861b1d673689787/2075779028.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608773bade386---93733518510.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/k3794fptfupvprmpo26citrdef/pusafifafefifo.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/gopifogobep.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/towubax.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1664bba9---nakamazawekujazawometile.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609f9d79c487f---sejuti.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9d3b23ff7f981d4364c4e6505072e48b/28914384173.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cebc815387c95f435172e7ca33273bf7/94162276601.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kaxorit.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f19ea40cf0---67275723224.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bdd689168---61937439266.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/14172521701.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970262a1265---87519279761.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e10845260---vixawulatodesi.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210810_10617A222BA17939.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/93b72d58fff604053120caead3d0c3e5/12862320681.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/zililezupanodidamog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=chemical+bonds+pdf+downloadPDF 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_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 10944 bytes
SHA-256: 79bf35261cfaf961b998c933b6490de1d018ccdd987af8f0a5c94a9f21b85c46
font_01_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 17512 bytes
SHA-256: 233c528fceb8df67c9814e6bcb9e427c906c8b503003bb92f5714a5e208801c6
font_02_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1