Malicious PDF — malware analysis report

Static analysis result for SHA-256 45aa1fbc4c20f87b…

MALICIOUS

PDF

89.5 KB Created: 2021-06-29 03:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d6184189e0c4810f244e7afa6fba32f SHA-1: 1d651cdc8b1d1a48eb1e6123f610343eab6c967e SHA-256: 45aa1fbc4c20f87b1d45ab8393b11878a00ff7a12f24b10a9bc295218ec0c452
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9513dcda37e362e0b17dc0c5f6b805fa/wujuzaxubomuwumuvegepolib.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/699085d05cef596f05a4e04796bc71e6/dulatifurebezomoxopuzu.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6816343eec19fde94e5433a0fe483e6b/47469831260.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/jmsga4qv1glgdo7t4s2v5albpm/46415558641.pdf
    • http://hyundaidongdo3s.com/images/files/55343903861.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7762b82510bef2aed2784b68fcccf540/53003869671.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc787ad38a---lotemebis.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c987f5c89d---misagoluxebagijopezozuwo.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad986184355---1908084130.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/ejprudv69g04qvol39hsnmoihg/ruxijoxajosi.pdf
    • http://koryosushi.com/uploads/files/bavelaxan.pdf
    • http://timandlor.com/userfiles/file/18195236219.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7326529c8c96ba0e93eff42b25fab502/dudevanisudem.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2f4903b5a6dde404d8f2aa08ee51c6f3/pevuxojazirapi.pdf
    • http://abpaluso.com/upload/file/gakurafokelajokal.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37098057dc---97478700440.pdf
    • http://liyangah.com/Upload/file/sukogovipedakoda.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sraas79jirvv3rsaj50gh91srq/lojavazitorimageta.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/3d9c7561df6baa1017421495e838c8cd/puvajiketakebevutogedi.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19cbc378d1---bozuwevo.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f0924cbb704a816e4a0def644562d8d0/58356096356.pdf
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/xulubadalowaxewalegig.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8a8a48811---49324362281.pdf
    • http://drapa-technika.cz/UserFiles/File/gozogowo.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/51dbe3c680cd326401cb002ac696d55e/motovibuxuzijurinereza.pdf
    • http://www.motorradfreunde-toggenburg.ch/up/files/pejeriwoxa.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d00e4d660---83636274100.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=early+morning+workout+quotes
    • 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_off0000fa61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 16792 bytes
font_01_sfnt_off00011278.bin
55fe726e90b651037c2ce7d059fd6b36262162f2b7bdfcdeedc316946d57e1e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 10972 bytes
font_02_sfnt_off00012bb3.bin
f60299fe10ea23be2ce474702a7a969483fa3f77698e82a3e2f8e17fb0ea6921
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB3 17292 bytes