Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fd9f55d268ade3…

MALICIOUS

PDF

84.7 KB Created: 2021-07-01 15:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9320be22d9d56be7ca841dc19b7fe313 SHA-1: 51459be332047f923c4acc430057a8f174ac4cd2 SHA-256: c1fd9f55d268ade314549d92b3865a282896892bcd496f3be2600a5c5d28962b
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or appear to be disposable. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://klubalfa.org/img/userfiles/file/migozedisuwikalevapexared.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jrra6e89p94dsd5g5l2bof8977/74424877581.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa674ae462e---95644523730.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6cd3b8f6a0c044a0b2aabc44ea5e60c9/jujarokadukuraw.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/42634141a24cfb198bdf6f1f3577cb68/37736396521.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082b95b827f9---rodow.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb119d00cc6---dejuxavetorixewanuzerikap.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e16fbd2be---79223773022.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce1c4ccef---turalufuvazuwivupu.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16097d34461566---robebekivozumurimovo.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3cac85816---29910302432.pdf
    • http://innotec-industrie.be/userfiles/file/wazepavimalulonixazujibar.pdf
    • http://szentdorottyapatika.hu/files/pedekeravejipi.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/mugivoxiwivapi.pdf
    • https://blogsma.com/files/xugimebi.pdf
    • http://bilmatbasim.com/userfiles/file/biridulok.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608367cbc95ee---49915478873.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2327956c3---zubogelilexudulodi.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c187dcf28e---sikokajiwipesegipezo.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/3b52df2e362986322c6984557795c8aa/kaxinuguzosuvigiba.pdf
    • http://promocode.lu/userfiles/files/gofetizavowemafi.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/vinuluwogepoku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=why+am+i+overeating
    • 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_off0000e9a8.bin
9c0abdee31371bdbf7b79cbf789e1bed5894341d01cbc8eeda68d2e272225a1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 10512 bytes
font_01_sfnt_off0001016e.bin
0d1636d5aeacbb180d6de7856e50ae62ff5c7835f357130cddf2ac12ba8fcf59
pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 17064 bytes
font_02_sfnt_off00012df8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF8 16792 bytes