Malicious PDF — malware analysis report

Static analysis result for SHA-256 337f1bc1ef138c83…

MALICIOUS

PDF

82.1 KB Created: 2021-07-07 01:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae2675920fff2d3c9760f36a65d0635b SHA-1: 580e7b6f9213fd56b49f77cba4607aa75f20120e SHA-256: 337f1bc1ef138c837a7da980cd1ed0247d01df3a3421324afba454126dc63b0c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing a link farm, with multiple URLs pointing to disposable hosting and compromised CMS upload storage. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context, and ClamAV detection confirms it as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the nature of the links and the phishing lure indicate an attempt to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://lab4050.com/upload/editor/file/busawiwipumemelu.pdf
    • https://brickbodysupplements.com/newerac2c/userfiles/file/54910120437.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078830191ef0---38308821945.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/3ii9ooiu8i0293bbtnghkc0e5c/fumezedoxajeze.pdf
    • http://nhasachconggiao.com/luutru/files/vegevujinexaxofiwisa.pdf
    • http://ccforum.kr/uploads/file/1625218914.pdf
    • http://medica-brno.com/files/77024149636.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/20ae6c46309c5080e3422796a4c59109/mamolarimebojuputepoloza.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608260c61ec16---zisox.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/73ghehj1qij7je5f0cl7860rd3/47650431735.pdf
    • http://anhbanglaw.com/userfiles/file/zenaxe.pdf
    • http://wo-kop.pl/userfiles/file/wogizijexotikumekud.pdf
    • http://libertyquad72.fr/userfiles/file/votosanumedul.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/diranuwikifotugabubo.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3c1853c7---puvujod.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/bbd65c79eb02e7089f1ea23f9e3efcc2/20737882510.pdf
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/10530068012.pdf
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/lojepifofatafuronog.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/xotimefomi.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/xalapeluluvupamaze.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cf93eb50b---18258611201.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cda3fe14e07---27957599120.pdf
    • http://slsnn.ru/content/files/45756752869.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d8299eef87b1bcf1eb379852278eb0b0/42107958072.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bf5877d95---31752042248.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=csir+net+physics+previous+year+solved+question+papers
    • 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_off0000dc0d.bin
744d5c7c3c9b96c451a1fe8e81dcceb31acdd9bef5c5c52603d5658aacf77989
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 11068 bytes
font_01_sfnt_off0000f592.bin
4ea7b0bf25a7a71c923bf06508c1e4b8a702a5e3c172f69695c0c42247879fc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 17196 bytes
font_02_sfnt_off00012297.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 16792 bytes