Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f319157569ddf84…

MALICIOUS

PDF

70.4 KB Created: 2021-09-10 16:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94f508fbeb39582bb92863578499fba3 SHA-1: 017ce10ff9b7d469e71442c2652de160108caf05 SHA-256: 2f319157569ddf840ad980cf08795d022a1c07384e2cfc9768b7dd3166988518
224 Risk Score

Malware Insights

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

This PDF document employs a common phishing lure by presenting itself as a screenshot, encouraging users to click on embedded links. The embedded JavaScript and numerous external URLs, many hosted on compromised CMS platforms or disposable domains, strongly suggest a phishing campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 70 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=save+videos+to+sd+card+android PDF link annotation
    • http://cisseo.net/userfiles/files/33844149133.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/62472786318.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/kujilugukamejoderiko.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/30e96a64822812579830e72620681722/77139155176.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/80140316813.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/88140576151.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b311a53f69dac6e87d2d241cae285c76/13412834071.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613003cda38e3---98738152902.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/zodezezaxuz.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///rekotaneropisenoxawolijom.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/76637358336.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/zenodoneviwofinawota.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/wiguxosowaxagotokabufe.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/ribologavikuwut.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42895467814.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/96092251836.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/51214297403.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/31595823506.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/zavap.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/ruzidilixezoxamixoveg.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/jikemojisabopimojuzenija.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/63009421718.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/01ae64919997b63423ef6c58dea54169/93053648390.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/lisobawagesu.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/selimi.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/83266624749.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/19263191152.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_off0000b896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB896 14140 bytes
SHA-256: b6291ed70a44e2b99d32cc7782e6f4d4c205485f24932d91814c697c0923877a
font_01_sfnt_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 10460 bytes
SHA-256: 68e4a1e900c7916255acea00c55ac10f41ca8538a6833a5858387b1a5d08d1e6
font_02_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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