Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ef0a31f526ddfa…

MALICIOUS

PDF

84.7 KB Created: 2021-07-13 16:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeb700698cd79d9278d36b8da951bc30 SHA-1: b1ed6a598e59448d91d68bb560e942adc7a45d3e SHA-256: 86ef0a31f526ddfa1f55c6615046700ac461c7374e20ecaa2d6cf050d6fd97bd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/38c1f2e61d81119017e718c2ef213d5a/18723941625.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b095499a2---35536544150.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/4af4412a18096827763584586e482bd1/52699878315.pdf
    • http://rolmech-strzelno.pl/Upload/file/84021530583.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9edd54145dee502e2c632f39a7bf6192/65909358842.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd48a02ccb---vijavodiwejuravul.pdf
    • http://www.biotanika.pl/upload/file/14566538583.pdf
    • http://dui-antidote.com/images/userfiles/file/44583959427.pdf
    • http://suamayin.biz/userfiles/file/megizenitafoxidumux.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/2mnvfchrvka8ddep10ls8jcmgq/91036492897.pdf
    • http://10glazsikeyrosa.ru/file/wofadunadikulozudiko.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae7e74ff56---xebiz.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bd3321b7c---43847413483.pdf
    • https://apsco.ly/userfiles/files/viranedeporila.pdf
    • https://ctsgroups.asia/images/file/11324626454.pdf
    • http://hugslock.com/app/webroot/img/files/53536508471.pdf
    • http://sotel-perm.ru/site/file/24089265696.pdf
    • http://szpk.hu/_user/file/zurapobuf.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084fd2b5044c---40180836949.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/4fc1208581cf1f72be253f85190a87ac/ladusamegajivoki.pdf
    • https://foundryindia.org/userfiles/file/nanixelilaxizevajakob.pdf
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/84198005231.pdf
    • http://rheinmotel.com/userfiles/file/43914617175.pdf
    • https://aawyx.com/sites/default/imageuser/file/jokerefaka.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/717860d44da33b8fab9f6b6d6173fddc/favajezegobajevimisuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+a+mechanical+clock
    • 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_off0000ea05.bin
4c5b7295efba45a296b41e826420d50e4e3b19ad7d9b57c312f4a64ee00e6dab
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 10480 bytes
font_01_sfnt_off000101ad.bin
382609dc8b413caff6a9b42c323b13227602808ff05f584f4614824ab610a7a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 16828 bytes
font_02_sfnt_off00012d6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6D 16792 bytes