Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b040d12837c4d0…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 20:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e7a444367d8f9d31431b908dc951b15 SHA-1: be4b2ea9e914e400fdfd3264a5787f6712a83c6a SHA-256: 01b040d12837c4d01d7878bab76bd3a223b8dee6b5498b33f34d34e8c387b09a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which are numerous and point to various compromised or disposable hosting sites. While no scripts were directly extracted, the nature of the embedded links suggests a potential download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://mopi.eu/ckfinder/userfiles/files/76291921157.pdf In PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/96141403943.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ibocdicjq21qrnfeaugecsn67c/kemikali.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210902065746105056vcnkf9.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1490d62e---xoxesufubufixun.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/6493177831.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/39217038201.pdfIn PDF document text
    • https://angkagenap.com/contents/files/fesapuvu.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56429176797.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/widajemusap.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3b39glgth2tv6jmtif7lvh55v9/40800604153.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/93695503517.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/40324768439.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/83422590484.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/zigalagube.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u4kl9uc5pivun2d91ed90vfd8n/tuxipokizavokukutarowata.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/35636497689.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/gakeguxojamufi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5561f1d1e8260efb8236637cc6038cc6/lejunisasinoli.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/jilagek.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/31955879511.pdfIn PDF document text
    • http://korytnica.net/data/files/dosawo.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/tinezuxagemolelabediw.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/97660154486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=find+my+friends+equivalent+for+androidPDF 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_off0000b13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13B 10916 bytes
SHA-256: 01639edc58c4cc4fb723a3ee3797465a78e0b9b2fab5da3f2cc575a87c7df9ba
font_01_sfnt_off0000ca47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA47 14316 bytes
SHA-256: bdd842ff056c001e669bf74287ca16fa564d68603f3ea5ab9d9df63c22d4972e
font_02_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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