Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ff0d0e71991dbb…

MALICIOUS

PDF

75.7 KB Created: 2021-07-18 10:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87de308b4f567f81c1da4c49d6387b0f SHA-1: 82a9656b4bd76923485573e3dfa8b7e94fa21164 SHA-256: 32ff0d0e71991dbb687b479b833c2572b86233efdfcf7d5752a257babcda7918
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting. These links likely serve as lures for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oreade-breche.fr/userfiles/file/puxamazasomupikaj.pdf
    • http://appinaris.net/ckfinder/userfiles/publics/files/samotikixubob.pdf
    • http://mobilni-kadernictvi.cz/files/file/51299444096.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/semigoped.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/v8spb6ar80gppeeltl4811mgmq/26952643577.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/3t5nhur7nsplvt7jbit3cmn45d/47077670804.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae3d458450---seludedolowowubiwo.pdf
    • http://phutunggiahungoto.com/uploads/files/39788314796.pdf
    • http://ducthanggroup.com/webroot/img/files/18981365732.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e565e38e3d4---72963251826.pdf
    • https://sssmri.com/ckfinder/userfiles/files/72285831367.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d609bb2f5c---53274464702.pdf
    • http://nordicaluminium.ru/userfiles/file/nedilu.pdf
    • http://work4shop.cz/userfiles/file/jitesegosakisi.pdf
    • https://bwawarszawa.pl/upload/file/79180577222.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076166b04f20---zisiwabalekuvadarolezu.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/vnljqlgktba3c15e590ql2b0ve/litatosobeputize.pdf
    • http://albino-pitti.com/pub_img/file/xiziwobubanis.pdf
    • http://absolutelyneon.com/userfiles/file/tolipivixevobukugo.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f9fcefe90b223be71a9974f58ea4a507/bovodokotiweku.pdf
    • http://amphorabeautyclub.com/campannas/file/3181852804.pdf
    • https://mfdesign.hu/files/file/67613223104.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe93900b6---suxinibonuxuxi.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hb695r8mqvidslin2q2f4erco7/naserobazenogapog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+incredible+hulk+wii+iso
    • 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_off0000c361.bin
1a6c75e31a8f4ef7dbfbf01d08445277b19aae798e28eac68a78519d8f6e2956
pdf-font-stream PDF embedded font (sfnt) at offset 0xC361 17884 bytes
font_01_sfnt_off0000f195.bin
136ca0dbb450a497def86ad48fec931d569fa028c2813c383c134569c2b491be
pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 10588 bytes
font_02_sfnt_off000109b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 16792 bytes