Malicious PDF — malware analysis report

Static analysis result for SHA-256 7337b46805076885…

MALICIOUS

PDF

187.0 KB Created: 2021-06-29 02:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce9682ed6a5152655ef513b099257361 SHA-1: 3cf51053fd39ffcfe7bb76eb46e0a1fcac1cf5ac SHA-256: 7337b468050768856312e8cd624a489aea3024b418f989203425b350fefe417a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads, likely to distribute further malicious content or phish for credentials. The document body is unreadable, but the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to attacker-controlled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5252a1959---jusumukukufogizufozo.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079412789e3a---32935479884.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/s8svg49u0vs7rpa55abq081ego/31311415249.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c34e71eddf7---96511080385.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/83338161007.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e084f66e31---kufanuzufixojamalibizi.pdf
    • http://akcjonariusz.com/UserFiles/file/bodutavutewifufekuraxegor.pdf
    • http://manajrgvaaradhi.com/cms-uploads/files/gepaletepofolipu.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013535f461---beputopitik.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c581bac1c71---vitulefal.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/nituwanitasubirafugipu.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/62bfd45f7f7fd5a3a82810681e3c60a8/fevebimevukowotuzu.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b1c00df2---41400815823.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b62bbbe4b43---84630336277.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd164cd718---fosumuvubigepumipewal.pdf
    • https://samarpanbharat.org/trila/userfiles/file/63371528084.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a318620535aa8c8515c2894fc2ad8161/8127945997.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d225e69be1---gakabonewenuluduxefu.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/998d5eae9d2b2fb755649c20308ffebb/nigem.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/psds957pp919e5aiik3jhjmcn0/75017649244.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e2c289020---526676641.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2bfe0a43d---dugakeravupe.pdf
    • https://bursakaynak.com/userfiles/file/10685429872.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4943954def---jexulaneg.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4c125cf6a---20499872463.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bedford+county+recent+arrests
    • 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_off00027e3d.bin
7ed24ea9a887261ba4eb97fac768783261b1150733d5655390a9fed318ba0ead
pdf-font-stream PDF embedded font (sfnt) at offset 0x27E3D 17972 bytes
font_01_sfnt_off0002ad74.bin
161e1ba9a5710ca7f51668e8e4f7f590240089dc696a4843e89fe6d8712b55eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD74 10596 bytes
font_02_sfnt_off0002c5e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2C5E4 16792 bytes