Malicious PDF — malware analysis report

Static analysis result for SHA-256 22721bd03423a530…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 04:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b98391de7b7555be8bde0dbca6388ea SHA-1: b336b8db807fa95868acf21ab3eb631d0eea5ef2 SHA-256: 22721bd03423a53083d69390510da0aaa89c2dc58939018171e932bc5aa8104b
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://landpas.pl/upload/file/xuwoxapafumegaxulizof.pdf In PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/pofoliwa.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1fe843a84---37270960469.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/85745818575.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/talavafonozaxamuzariru.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4172603fc---8031778593.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/3489466305.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/68f08e9a4267edcd448c5a8c198e4af6/mewuvirex.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dedf7bb20f---nogukofasufa.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb7eabab5---68111801923.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/43198290326.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/11104231021.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160970a17ea857---tepobefarufizorigasusiwed.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98867212258.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/95484329758.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/86205612140.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//63446915099.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/barizokojepunek.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/tpbnc6rnake5mliiuk7lgnso7c/kinogurifomeb.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/kujewutinu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7782abdd5---43171916961.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/miniredesugubusaka.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ibptsn7hsij7gt9ld4djjqueat/84218160793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=baby+blues+after+birthPDF 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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 17460 bytes
SHA-256: a0796932f1b1575667eeb6c5e0fdd3f1df975c2eacf2d3f121f57ba424f3e1a2
font_02_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 10492 bytes
SHA-256: c192f703e23b78c1a5a2880e7c75b70bc3c08eb3dc7ea0efde242c439b53cac2

Open this report in the interactive analyzer, or submit your own file for analysis.