Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb1d53774cc246b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-16 11:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99867dc22886694d9d6be183f0a6b647 SHA-1: 28bf4c1961c6a99603b84ac93f1e64a30d1cdd20 SHA-256: 6cb1d53774cc246b29f909ad5371d6746acd11266d7eea05505d9d5f2bdad7f8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and numerous external links. Heuristics indicate it's designed to trick users into clicking through to potentially malicious websites. The presence of many links on disposable or compromised hosting further supports this assessment. No scripts were extracted, but the overall structure points to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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 69 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 https://inwebjor.ru/uplcv?utm_term=google+android+a+comprehensive+security+assessment PDF link annotation
    • http://tokyoto.pl/UserFiles/file/53363497563.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/99460609883.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/51940835964.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/sazurofobod.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15c9c3edd---jivovunakovir.pdfIn PDF document text
    • https://network-italia.it/file/51775500784.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142049d79cd6---sobenowutipigubikakigi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614297a672b50---4406868962.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/82106734111.pdfIn PDF document text
    • http://itena.si/uporabnik/file/gosujikavululugiketelesub.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/wegonisumufigakizikalod.pdfIn PDF document text
    • http://sarlampa.ru/In PDF document text
    • http://vina2002.com/uploads/files/71458611306.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/rotipirenigisogek.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/h9d7taag1o1m7ks2dc9lrbo3j7/30419796210.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/pogatupok.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/37db1f4f2967ad83121b9140e9d44e01/90945115885.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/vatizolipo.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/wenuwema.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/lowemuf.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/68518526133.pdfIn PDF document text
    • https://masukpt2.com/contents/files/kufusiridawimiv.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/mowojulatomuragi.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/37447787115.pdfIn PDF document text
    • http://immopolignano.lu/images/33508840359.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_off0000b133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB133 14220 bytes
SHA-256: a17a1546e2f2481017df4ab9f9881fbec2942d9df58329fe98ba88aed71014cf
font_01_sfnt_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 11280 bytes
SHA-256: fef4e0d8b659b18a2a1f94bba378b5ae01fd34f915d042e1aa50d8e600795a19
font_02_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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