Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d35f9eda706f74…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 04:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be2af0d0edce88e9a0e814bf2e80d1d1 SHA-1: ab59a8b6300f035208e3da313223bbee8abee4ef SHA-256: a0d35f9eda706f7442294fa7235b86c9fd83fae8dbc8487161ebd3ba76f40c2d
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The PDF also functions as a link farm, directing users to multiple compromised WordPress upload directories and other unknown domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • 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 http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aec3ef994---17403857764.pdf
    • http://beijingbeat.com/contents//files/fekililolot.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9afcdd2748---25748556245.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0003344ac---rurulemikex.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7a7311c0d---bugijekujovigidelugezoxux.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1597ee77587605e5b2eda3cfcbe46b73/mumoxidu.pdf
    • http://industrialdevices.in/uploads/bezitaputukubaxuvukokaka.pdf
    • https://bursac.net/userfiles/file/26826693055.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/73a413385854c2f892183e93b705743e/tozije.pdf
    • http://efuturesthai.com/uploads/file/68214784641.pdf
    • http://norilskgu.ru/userfiles/file/47179144927.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c935bbdaf49---rasemuferewunobomol.pdf
    • http://docando.es/js/ckfinder/userfiles/files/pijiguduxomirafi.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/nimukaxurimisofabinudeto.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/uvpasftth27668bac6nekgnp09/zafiju.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/bamowasasoka.pdf
    • https://observatoire-omic.org/documents/file/57289295921.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607890970267b---zumeta.pdf
    • http://learnersdigest.org/userfiles/file/merajovozejon.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7af73503bfe9427ff8ae6b2ae638632a/tesesutituvemaxezufuk.pdf
    • https://toskov-yordanov.com/userfiles/file/dujizuke.pdf
    • http://accessiblevehicleservices.com/userfiles/file/vetimojunodita.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8r2aq0hd6j929u4ph9o4kc0utt/kowejofimivovupivifal.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ucr+computer+science
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d900.bin
62d6b395868f4c35a364d29d1cce4e9c64244140863299cc8b04567748b591e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 17320 bytes
font_01_sfnt_off000106c5.bin
a8d1e34bf444334761db8dd673e30599a677bf9ec537d4b136fd145dfe542046
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 16416 bytes
font_02_sfnt_off00011d36.bin
39c1de55672a1cc6240e676a33436e46e2d5f356744228aa30e80b9146b2582b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 10436 bytes
font_03_sfnt_off000134e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 16792 bytes