Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d8e645200f573f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 09:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd744c03d7054a0aa3632251252da8ef SHA-1: bedc168c5e93c2ee35451ad8c016d96651bcf2bc SHA-256: 46d8e645200f573f221c7d398bd111a5b3d048d59e4b55508cc442c97c1eba13
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/c08b259e176fee8075260133f2fc3ac4/pabuwusamokagi.pdf In PDF document text
    • http://www.asap-recruitment.net/upload/file/fubupasimizuw.pdfIn PDF document text
    • http://afro-safari.com/upload/files/mevimojubemezedu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc07d48bbc---tamukopudokagabomotudatu.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/37840394022.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/nozileliwetuduzugixuximi.pdfIn PDF document text
    • https://tigaintan.com/contents//files/66665827285.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/ravega.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/rifimujeferodezakod.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/28d0789fbe8ee19620c11a32958de6b1/16544275579.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a8a889d9a7e83ad55d78e72292865318/26005369760.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/27527879672.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/kbb3km4sitd9c3nuro41f1tm59/73049175584.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609171f511291---47586087925.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/kogosinevigok.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/20748588102.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b55a1b41---45103195275.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/36729759188.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e9b48de0ab94f7469d7693b59bf6fc48/21775080386.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88e3db1ca6---minunugalodenex.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/47281366426.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/bfef417a685e76ca11712148bfa4253b/pesimudomuvowomu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3rgn5ag620q7o5ht11jpvr5lm3/42469511802.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/38910304799.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f48c9d7ed7a---43628402772.pdfIn PDF document text
    • http://prosquash.by/data/13497986784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=manual+traktor+pro+2+portuguesPDF link annotation
    • 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_off0000d232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD232 18416 bytes
SHA-256: 216a9c343d81efba976f1c220a91422d9534533b6e0d29bceb125adcacb5b9c9
font_01_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 10640 bytes
SHA-256: 822bf117fdfadf5890802de5fb3b4ec5a76ab5bbc6e809ad2d088c9aebe6b2f6
font_02_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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