Malicious PDF — malware analysis report

Static analysis result for SHA-256 170685633187fc6d…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 21:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43f751d48a5f81cc4fedd9f141cdd63e SHA-1: 8713dcdb268359323551d386e4b31e4b103ef6c4 SHA-256: 170685633187fc6de6ea1cc2a4ca20423a2822a20d9e361ebce59813244bf19a
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ahxxzx.com/userfiles/202105/file/datitobuzufom.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba247160388---sajibugalademopi.pdf
    • http://ateliergermain.net/sites/default/files/file/81026212895.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe433e6220---89959712737.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160793267a3a01---41882752686.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/octg5btt1bh7c0qb21rfvt96g0/75780715954.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/pidikon.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b138d642---52115684851.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e998391eb8---rugaratan.pdf
    • http://accronline.com/userfiles/file/detagipalalexamepiz.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/29e1254fa1b7a7b5dc7297a9f42f84a9/sepalowid.pdf
    • http://bulgankhangai.mn/userfiles/files/rosotoke.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/namivixem.pdf
    • http://www.biotanika.pl/upload/file/3050789.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2d489g1j2m5ljnk5imi78pfddo/burivanezabenujalod.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b48280f64d58d1ae4b5d6709fba951df/kinupitefuzekotatonax.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d91e23db8---tumozovuw.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608323967f233---tudezavotuzi.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8b439e278d1bf77d33d1a3ae974c756c/rerubutilipuwugoka.pdf
    • https://standardpromotion.com/images/upload/userfiles/files/42274486017.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b68e409830---29640134062.pdf
    • http://ahcxdq.com/uploads/file/231254226183.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2f92ba25bcc2c94a4b50a360a38a61cc/41676077001.pdf
    • https://vettercycles.ch/userfiles/files/18289367050.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071c335d5dfb---1445142098.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rule+37a+of+ccs+pension+rules
    • 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_off0000f05b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 16792 bytes
font_01_sfnt_off0001086d.bin
e30edaf9a12b454a16beb0997ac7375c97029cfbd2935f82c403ffa9c66a6e35
pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 16716 bytes
font_02_sfnt_off0001340e.bin
ea25d0b68d2d9164583416b401fb2a068ac5f64af6ca14e3d74ab51893ed9c11
pdf-font-stream PDF embedded font (sfnt) at offset 0x1340E 10740 bytes