Malicious PDF — malware analysis report

Static analysis result for SHA-256 068fc3f81e6190b8…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 08:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 70a9a94bed49bac1ca02e2d93e03135e SHA-1: 58d05a9d4fdc78284c8142cda9dab7aba87174c3 SHA-256: 068fc3f81e6190b8cb051a10597ed869b7661a98ef82f67340646bb08d4f2392
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards an attempt to redirect the user to potentially harmful sites. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a common phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=crochet+basics+pdf+free+download PDF link annotation
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/80d53142e04a4855f90742ffa0389150/tibogulajinasujo.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/53ekt3orpcvjpaloojk71pbbo0/5815905430.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210827095133.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/15990529037.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/vosukavevotomazewu.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/39876094355.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/69f6b5945c3abdd2ecabccfece9ba079/94082293559.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/5ff96164354d1c96c2736e7d26c58033/75028123806.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b458be57a5---79819025922.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/gowokifojaw.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/58754207319.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd78b16d2---72092086044.pdfIn PDF document text
    • http://emannsltd.com/userfiles/nojagewonin.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/newomerezimero.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/utq15jr9vm6vmsa38hbs33do43/22362244105.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/88940442407.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d220e522375---julufetufesuwila.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/bakalegetivuwugamopobijub.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7eb454644---85041580645.pdfIn PDF document text
    • http://szpk.hu/_user/file/68047933193.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/wupebuzo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/88f27419ed508651c188abf1130401f1/jororogadagizajezi.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/37213459734.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d3c5577a8---givezimobofavagivegarulij.pdfIn PDF document text
    • 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_off0000c172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC172 15760 bytes
SHA-256: 2b27247e74560c064ce1f085c6926a3e8f15ddbf53695022d2e2016cb548996c
font_01_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 10972 bytes
SHA-256: 38c0f43a1929fdb6825d91dcf50a162f140eb0e0127eca254731b4f747b3f08a
font_02_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1