Malicious PDF — malware analysis report

Static analysis result for SHA-256 299c0d00012ca6bf…

MALICIOUS

PDF

90.0 KB Created: 2021-09-19 04:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ce54baf15edcd306a24f3ba9f030cb8 SHA-1: 1d07b088b1ffd28305e3279749b711c440d2aae4 SHA-256: 299c0d00012ca6bf83cb4a99b00968ac0c9840b0b1690c2c82d057b14684a869
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely serving as a lure for users to download a malicious file. The presence of a 'download button' heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://krantiservice.com/ckfinder/userfiles/files/xabami.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130563f568ad---filozuk.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614085cf20c9c---28024680259.pdf
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/38689813108.pdf
    • http://mrs-edu.com/sribati/editor/uploadfiles/xinaruvogegudomebefurez.pdf
    • http://186086.com/upload/files/19358493166.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142459f34d05---jowusefimopitegefalu.pdf
    • http://forepic.com/_UploadFile/Images/file/13931648867.pdf
    • http://grafiport.com/userfiles/file/lokak.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135943f4eb7a---96067923895.pdf
    • https://tmtteks.com/files/kadogitovofivonekudoso.pdf
    • http://glassick.com/userfiles/file/lewivan.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd4b1b9217---37714143188.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/majibosolunor.pdf
    • https://simplehome.ro/ckfinder/userfiles/files/soforulax.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ea8cab58---54160000152.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466f9b32842---vozusasipalo.pdf
    • http://uktohabbarijamalta.com/files/file/81000340985.pdf
    • http://kimandyoo.com/userfiles/file/gaxanapaxakapokew.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/36aa02723e28cfbd9126b18a138e49c6/36112747641.pdf
    • http://fnathservices.com/upload/file/54676162336.pdf
    • https://adverto.ee/userfiles/file/3202177851.pdf
    • http://air-con.ru/upload/files/pukugo.pdf
    • http://www.gobarging.com/uploads/textareas/file/pipagofodoxifapavitef.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/zowenujasuxevawo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+auto+rotate+home+screen
    • 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_off0000fb9b.bin
f8498f8eac242c843af29828a1a03fb4aecd70b6ef34733a96ec3fed023b3a05
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 17576 bytes
font_01_sfnt_off000129cf.bin
1f8d682a1066dc4a393c3e9b944eb0325890882ec794510b6dfc5f2b397311c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 10672 bytes
font_02_sfnt_off0001421c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1421C 16792 bytes