Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa02e9acbc8ec7f…

MALICIOUS

PDF

93.4 KB Created: 2021-08-24 05:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56c73f4ec2f380ce47de1d17e679780b SHA-1: a3f3d43f8c3ee9eecf1e18b035cfa4c62fd1e2d1 SHA-256: cfa02e9acbc8ec7f442c46f3baec6af6450c3bfb1bc922c6c2f5d2aef8dcbef3
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to external resources, including compromised CMS upload directories. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/69466993670.pdf In PDF document text
    • http://aucoindeshalles.com/menu/file/53072922622.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/76f604ff8df3550d82047a6be5d926ad/miketikotunotosikidewe.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/vapefomevejitirixiferedov.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/53128536439.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/vesekorarizoxopunu.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/mojazufukimolamizonon.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m97jna8mek6kjemq86j8kjlql2/tedaritezetu.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/xekevekavizimipumib.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fc844ba9a8bb58286075b9776f1a4597/xisadanow.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608db52c2ac80---ziwojotisixon.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/81766853920.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f887adbd7bc---tuzis.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/75292578937.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/gejemiduwiv.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mghlftq6d4lhinlq6p55uof6m7/49504480621.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ee20fb650149534a46acbd18d40e29af/87697243151.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/74a8ebd71b51062cc028b267fc36826e/verut.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/461edb9331f8a31fbbb6e0e3c945cef3/sulit.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/vomaxozezerimamaputeraveb.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/41648878604.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/23ddf065fff6b1b8241fad2850613628/lemidefamerivuladirel.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/38097564261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+feed+as+a+vampire+lord+skyrimPDF 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_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 16580 bytes
SHA-256: a60fdefc8ed18510ecde4342dd0f253b9824d4d52273899a87240a3d8154793d
font_01_sfnt_off00013636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4D 10904 bytes
SHA-256: 63eb947d13dd57318498bc109ec05ce749c25a172bedb30b3eff26a2eab4ee3a