Malicious PDF — malware analysis report

Static analysis result for SHA-256 055373acf738c5e4…

MALICIOUS

PDF

89.0 KB Created: 2021-08-01 10:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3a89425c7529e8d036cfc4582b7fea9 SHA-1: e4a6b9a591f3c118639de7af9417b1f8e25dfd63 SHA-256: 055373acf738c5e4d35bf80a6be7644b14dfa48fcff5eb1a8ae40b2c7854abb6
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS platforms and disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded links are indicative of exploitation attempts, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://tehnicgaz.eu/files/file/31406842775.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3b352f568fc3a64ae761f96e4fc54963/voloterekigopipazalezig.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/981996b9acaaf32ebd0d788481bcc188/susanepobapijonemixoxi.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/87705694807.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/gubizifovakuganin.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/muziterevu.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/5407k6la8t1ioi69uue3ocapjn/lujofixojopuk.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e39e7315956b97db6502b10808a32f94/fadubamepopurufiwisoba.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e09f1c78d52---mifidegu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608174a02ef2a---lililapaju.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/55357394704.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/12582195003.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/winopetiropawedikilado.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/4747938185.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9578eae8b3---jevure.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ff917047e5a---69590098644.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/fobegazevizisokenozigovo.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nozag.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/28145472670.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864fb62faf4---90522203142.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3d5c1a9c4033d0405f5bf8c5876e77bf/mufisutaxezif.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/bogigenevadabirodox.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6492707c131551e2d4640ef13cacf2c5/patit.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/98256744859.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/bibuxufamopajuki.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/40597697069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=openstax+college+physics+solution+manualPDF 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_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 11060 bytes
SHA-256: 2cf214c1cb34aef542f6b2e9bd02b24bf84b63962501bedc49fccd683c3c6f5d
font_01_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 17192 bytes
SHA-256: 59ce5b34e607245e0c4cd97e66755735d78a24bff4aa0cd5abb083147c827936
font_02_sfnt_off00013d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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