Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b518ff706c4f3b…

MALICIOUS

PDF

89.8 KB Created: 2021-08-29 10:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6028a70cd3df693f7d33a8a61902bba6 SHA-1: 81dad6bf1e107c1af19d005a7d85a1e7f1f9629a SHA-256: 31b518ff706c4f3b39f748fbeca4995d9c2985ca04d282c2327d81fcd8ee05c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=emerald+the+hunchback+of+notre+dame PDF link annotation
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/kkcdhddie903tnusc68u6f238d/raxizokonezutixegifes.pdfIn PDF document text
    • http://dgjst.com/upfile/file/12654722665.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/kanilosirukenevi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p6ko8j9g24a5939nfo0a3s4ic7/55415591295.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/somewevesarajoti.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7312a3b71b86495a989ebd51ce6a6cc0/41765443935.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/6261279265.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7442beaf08---poladubisupe.pdfIn PDF document text
    • https://temahr.hr/files/walonawedokezusi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3d019d4b---47272360694.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/15cb7a80951f6d4cba62be30c4c150bc/53934080994.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/96144016191.pdfIn PDF document text
    • http://deauville.ru/files/file/xojuvukuxe.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088f23f6f113---14348007164.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b89p8ed5escihonf9s8fskf3bc/1468508536.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729f824905e---23649199663.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/gazamawumow.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160762f1812b95---pikise.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/koporose.pdfIn PDF document text
    • http://www.bash.cl/media/file/35884977198.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021061919542444.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/52949260919.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/32981948661.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/7gg4lhvsbl6901sbdth3rnt434/60093470006.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a9eef1695---19070719572.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/momitedenipa.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/10963570167.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_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 10796 bytes
SHA-256: aeab863c201461349a8d2254e2c2561111a241983db88dbe660c9be533fe90f1
font_01_sfnt_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 18748 bytes
SHA-256: e93c559c6c4b53f8ce3ac070e5964a660f48cd53d1e428d161365172f717ac4f
font_02_sfnt_off0001409a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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