Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb5e2432a9fb23e…

MALICIOUS

PDF

92.6 KB Created: 2021-07-25 12:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60e2d30c3a35aaa4a8846cf35fee586a SHA-1: a7f6e81ae7a077c5bd337e544d12e011f07cd9c9 SHA-256: 3cb5e2432a9fb23eca0d12f3c28e7c2c7713903f8c9d192fa51c63671dc626cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm hosted on compromised WordPress sites, directing users to download other PDFs. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e124580f---volijomaj.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zidikodu.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/bawabubejopifare.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/xowojuralebapenalimiso.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/6336782025.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/61it2inmlhuq11uu0bvmims5a4/418258320.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/43527031305.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/a0b87bb826ae049bc775d7702153b228/12268201951.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d26d9ea78fa26d250a9381ba495d9b5b/xulewipugatugikide.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/rusepopapapuvojitu.pdfIn PDF document text
    • https://melz-feu.ru/upload/6754643229.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094111e6b17f---nudeximovuzarigovifulok.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/83828958255.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f51772273---gonojurorama.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/9771436027.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/nibodanikaxuwuwuda.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f80ce75acb949a13bcadf6d319682670/36844839399.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160f8cdf1eab66---77422954.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/a26b691123eb966f1317b92b56ab3505/54864022548.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/c8nnt6qjvisg0n61ims4660dnn/xurejufab.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a576588286---bejugakewuvovaruluwip.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/49283459822.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/33623552773.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/35143758075.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a0eb3014---lonurataxuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=good+workout+to+lose+weight+and+gain+musclePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 17832 bytes
SHA-256: 9a1f7539ff343a818811004f982398c0ccb27beab66e24802871b8e7fceba1b4
font_01_sfnt_off00013161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 11136 bytes
SHA-256: dfc8c35a03a2a57501712bd4e66e7c1fd3a848eab62908313a11eebf7c852058
font_02_sfnt_off00014b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1