Malicious PDF — malware analysis report

Static analysis result for SHA-256 651fc307e49d9438…

MALICIOUS

PDF

108.6 KB Created: 2021-06-28 23:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 788a04b55cc83c7b445744304360603e SHA-1: 6e94f71361766b766968b14f6c7aeb4972b6bb41 SHA-256: 651fc307e49d9438252cf00dd96b60cbf813494e37b954b1f106e50485ac8736
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and links to IP addresses indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/69364b710e478c47999f6ffb95cc90c8/21642606570.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/96697949012.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c7792c956ef---wejaz.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/61e586066fe7c36a3f5d7737ce3b0b02/tubebixemexam.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d375de57e93---xoputo.pdf
    • https://soudurelauziere.com/upload/editor/file/mogiwazuboganevux.pdf
    • https://hyundainhapkhau.vn/upload/files/82501644070.pdf
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/fiwijerejinun.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dee50c4c9---98816718066.pdf
    • http://usaoxin.com/userfiles/2021-5/file/32012083925.pdf
    • http://bogelaipigeon.com/upload/file/derejigonef.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d0eded61d462301c1574446764dbe55/sirafab.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160779fa9c4044---99499296035.pdf
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/rusubuwisulibavulopi.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/be1f678886baa76ce88fe7c9f37e404c/28875650318.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/b9bf3ad0e5ba39f6cd2987c74da830df/79758321092.pdf
    • http://poolprotektor.com/userfiles/file/31912257169.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c6773541---3251272399.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d99a4e083034d97942b24c4e8cc77787/8064178390.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/70218633778.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18ac529fa---wejamebefarupisiruzipemu.pdf
    • http://inter-travel.hu/_user/file/vilukilakejegu.pdf
    • https://baoholaodong24.com/userfiles/file/gavekumimoni.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160768438e82a4---99930304018.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=meanwhile+in+parallel+universe
    • 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_off000146fe.bin
5b456262798f68e9f8b84372e1b0ef8f3bff851cb6f0e1f8cbf95b8c67fff8ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x146FE 17836 bytes
font_01_sfnt_off000175df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x175DF 16792 bytes
font_02_sfnt_off00018df6.bin
2073318f4c9f184ece6ac11a2f60a50be5c73b29609f4f3e93deca9a114a433c
pdf-font-stream PDF embedded font (sfnt) at offset 0x18DF6 10376 bytes