Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a002312cc026e2…

MALICIOUS

PDF

84.2 KB Created: 2021-07-04 09:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed49f686818d98774e054ad4cf19d77d SHA-1: 29e64937bbf3cfcfe7a47058cd3a8ae61c5c0cf1 SHA-256: 52a002312cc026e284675bce189252dc8fef7235d851d58283649ad126d177e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the presence of multiple compromised hosting links is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4a23623d932a5627cd42e658334e4b65/badajof.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7a114fb7ecfbc010476d15b43542a253/71642138460.pdf
    • https://editions-tlp.fr/ckfinder/userfiles/files/56410551262.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23165ea7a8---vuxepuxixutedawafozufubim.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9c28525982fd61fd7f29527098fd5eb1/xolisexotevokugowazulof.pdf
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/jarugokepesobogalo.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93b909458---72540214336.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c682e2bb6d---senexod.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/modasepobow.pdf
    • http://rotang.net/userfiles/file/semunenetax.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/htjr5s0tu4ocdv88db5oi3aedc/95276828014.pdf
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/8437360965.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8ba7578c875703fbedf7b5f06fcec85d/sasowasososopuvuwaketozaj.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c580a0af62---98627335849.pdf
    • https://parfumzone.ro/files/file/62540227817.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1634c2e42---ruzakuxaxitipopepakedusi.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/669c337e956c78f4463b79e76551f311/16844518150.pdf
    • http://bet-balance.com/userfiles/file/duwatifixexemunabu.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2267b71bdf685442fa0c5acea6930a65/88790859384.pdf
    • https://adepotcustom.com/UploadFiles/file/20210501032614176.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/908deb19c95fd3ac2ff89f876c0b116a/zasisekewusa.pdf
    • http://stlnsk.ru/uploads/file/41107190107.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=verbs+used+with+gerunds+are
    • 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_off0000e753.bin
2afe8ef9a3509b06f1bf67f7cf42ec081e59f9b119c125ca59f57f1fa51f2ba1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 10656 bytes
font_01_sfnt_off0000ff8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 16792 bytes
font_02_sfnt_off0001179e.bin
f1a8e48a078e25d8647b87dc410d9edc74339a38ff76b7e6b43365b2c0bfbeea
pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 17040 bytes