Malicious PDF — malware analysis report

Static analysis result for SHA-256 7870e6ad444f0cbc…

MALICIOUS

PDF

88.4 KB Created: 2021-08-08 21:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04e0f92cdd87ac046bc1a89331b575fc SHA-1: 42ff6ea9b6e6314075280833c627d357d14ff45b SHA-256: 7870e6ad444f0cbc68fa55adadd9f2d0fb4ec29ca276a844fcd50f97f7551642
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://cephedanismani.com/images/pages/file/43651511902.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54b9573864---newewixamobugip.pdf
    • http://malbreil.com/userfiles/file/rujewuwuxunubamafolager.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b12ca9a28d8---64318599398.pdf
    • http://manixcnc.com/ckupload/files/durumijosorovuvagaledag.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/cda195bd481ecde47b8f88b9ccdf854a/nizepisoti.pdf
    • http://ibshop.gr/uploads/_uploads/files/jelel.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/69f068093959ffeff3d1c3c0127eb24a/70232789661.pdf
    • http://www.niziointerior.pl/upload/file/nozewebuwenuvakawerab.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/vibifej.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/fojuzotazamejad.pdf
    • https://trotusgrup.ro/ckfinder/userfiles/files/ritunagovalezibet.pdf
    • http://noithattamphuong.com/upload/files/rarazasuzodixapodofaloga.pdf
    • http://www.huntsvillepr.com/files/files/tovoxasapamifege.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090f47b5f913---52349287356.pdf
    • https://norservis.com/files/files/24308483343.pdf
    • https://drisraadentalcenter.com/userfiles/file/vuwinamip.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160837dbc0284d---nesimogasixad.pdf
    • https://bandotrading.it/uploads/file/83295523219.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/92aeeba469f1e81a1f517d2e067c16ec/82619393645.pdf
    • http://pxmonastery.org/CKEdit/upload/files/26934760461.pdf
    • http://wildpflanzen-planung.de/file/luwijor.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/83148dca4fdd0af9873b32b69f1cedfb/96027122855.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f6b9cc624824430ad9f71c9a78505e56/22409699712.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c7be95a5---tapugifolezopufi.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075462976596---28575368769.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ejercicios+de+energia+cinetica+y+potencial+resueltos+paso+a+paso+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_off0000ed54.bin
82a0e5ea7b90b970da5d3a51340a4db8b8044f58512b842cfc0b4fcbe57bc886
pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 11124 bytes
font_01_sfnt_off0001072a.bin
3b1a6c562b7dad6947cd6f06033b4cb3d8b671a58f63b3c2b490326b454b8cd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 19092 bytes
font_02_sfnt_off00013810.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13810 16792 bytes