Malicious PDF — malware analysis report

Static analysis result for SHA-256 86585ba041e69828…

MALICIOUS

PDF

107.3 KB Created: 2021-07-17 16:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7c535f8c970a5db7d935beaf5a65be77 SHA-1: 7293011c696082f1c3cfc378e38687188e152751 SHA-256: 86585ba041e69828cb000eafccb2c82079580384915282cb7ee1ef315601a0b9
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised websites and potentially disposable hosting, designed to trick users into downloading further malicious content. The presence of a 'download button' lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9718

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607690675cb4e.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160adc815bbe4c---gekajanitanuzin.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c5f2d0ca348cc8afa59681e9770f5768/bukipumifa.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/82884512352.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/24801381060.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baaee97948a---46735252030.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ad80bb021aa460e3f0a9906d80f64c81/77671084868.pdfIn PDF document text
    • http://kbchina.de/upload/27873137097.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/juwafafodevi.pdfIn PDF document text
    • https://scriptdd.com/_file/file/44050686558.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/kuleg.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/66260184368.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0edddc85070eafaad00a2e8fed5ae425/podutefejexige.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fcc0de2201202ac24cf418edab1df7fa/54640932348.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/buzasalipuxapiriji.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/e41529cf70e37c9319cfa65ceb0277d3/fapudore.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/h05tn7p4cfc3tc157kbmr9br8f/53978264287.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160859eb23449e---2485224009.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/xufilamu.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/575e0378a492a2d3e2495f66b1a62aae/zujimefugese.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d915483591d---73388952547.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/eddcd5fd98d24437030552f82bf5faa9/65469085417.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/11773472646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lucky+9+zingplay+mod+apk+unlimited+money+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 2544 bytes
SHA-256: 95b4463e5d840476aa4b7d73eb747ffba7957d8f19e285fa5b4b4753d2c2533f
font_02_sfnt_off000137b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B7 11164 bytes
SHA-256: 32644e5c72bca4403e426f4c09d85a6bc30c870b7e6f805b83bc50f071d2bb82
font_03_sfnt_off000151c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C4 18928 bytes
SHA-256: 43c5ff95a4cd928c071ffa0ee3d4609afbd2256f6f68e71bc95ba2db705d3f1b
font_04_sfnt_off00018387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18387 17708 bytes
SHA-256: c45d48010918c99706efd35c380adf7c7d6cf1ca7028e797f8599cb30603dcea

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