Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e500a6912e0f30b…

MALICIOUS

PDF

84.4 KB Created: 2021-07-24 04:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0911abf2542b482acfe66700be977ef SHA-1: 2289050e731a323a465e2585990792cf4c59fb90 SHA-256: 8e500a6912e0f30b7507a0b3bcd9a9edc25570a96f667e59b1e0da38aac4c82e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised CMS upload directories, suggesting it functions as a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the presence of multiple compromised URLs strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e680d6d4e---gegupifubizofaduso.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c916fad816---zawalajoduxegekabalagul.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f9075f7ef50e7d424daf70ea0cf4377e/10588313998.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/c5otr1e99bjrbiq7gnird5o7t0/matovijadogijuwawu.pdf
    • https://sonarmusic.hu/up_image/file/62486350895.pdf
    • https://planet-for-events.de/userfiles/file/toxojos.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c679d0db6ef---77647433039.pdf
    • http://kunmobile.vn/files/uploaded/20210715/file/13748934730.pdf
    • https://ustunbilgisayar.com/userfiles/files/rigadamo.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/4afc549cc7530b7f35ad79bcd92564a2/lizetitetaxos.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/65b3a56dbd783f2281ce074469b72718/38408588024.pdf
    • http://remobudostol.pl/pliki/1822087872.pdf
    • http://abwcolley.com/uploads/files/79314366560.pdf
    • http://tyros-club.de/userfiles/file/59302590400.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c8502189f---50809490895.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a856a5c82---80925724707.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607196f613e93---3879466101.pdf
    • http://grgct.com/ckfinder/userfiles/files/befobisadaru.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdb92fd40---jizit.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd78aa2fdb5---zonul.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/janavakodiripavigodax.pdf
    • https://dhesient.com/media/15192554151.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+cidex+solution
    • 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_off0000e639.bin
193ce6aa3c085854efed42f1a328865716f5f3917b6f68ba38023326733ffda1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 16840 bytes
font_01_sfnt_off0001123f.bin
ce8d8488d2adce8b33d74d187d806f1817ad0d58fca62627638869ff913aed7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 10804 bytes
font_02_sfnt_off00012b2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2C 16792 bytes