Malicious PDF — malware analysis report

Static analysis result for SHA-256 723cdec9a36c1a3b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 23:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e34dc060f1142a855340ded2eb20940 SHA-1: f4d55977316359b546b699e27687214c34107849 SHA-256: 723cdec9a36c1a3bd050c6539b86a70ac818090bc1783ce0499a2d525c1ef68c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs, such as 'https://chcial.ru/uplcv?utm_term=pubg+lite+apk+only+not+obb', suggest a lure to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=pubg+lite+apk+only+not+obb PDF link annotation
    • http://indianmailbox.com/assets/images/userfiles/files/tugudolefomovuladepexaf.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/namuzagunararajulijotuge.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/47578158747.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/rojakod.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/nedubafanenanowipuvak.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/67280789541.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/jogazanomululumixuta.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1b40d8dc2---5455524503.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314ada8161d---54160471530.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee9ea31e9d---46847126554.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/funarav.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/11041645796.pdfIn PDF document text
    • http://imoroz.by/upload/file/74528104702.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/dipuzaveditewupimetonibu.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/rerapoviweworaxaw.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/jolirig.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/budediwidegunafeb.pdfIn PDF document text
    • https://preciseenergygroup.com/media/80271579578.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/72376847341.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/80522000294.pdfIn PDF document text
    • https://carlojans.com/cms/file/19191058904.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/nidiruwiretifokoj.pdfIn PDF document text
    • http://guitarenko.fr/img/files/jitopexilodugijofu.pdfIn PDF document text
    • http://artospace.com/pics/file/rijaxadufes.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_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 10608 bytes
SHA-256: 1603c63338ccd99dd18e83679e2bb5451d4ca8b56f4a6970bc32de4cd7f416d1
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 18152 bytes
SHA-256: 8904b4ff75fd32fad98a146adccb66de420ae2b0bb77f43a5251f450f494d348
font_02_sfnt_off0001225c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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