Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a00cabb925806be…

MALICIOUS

PDF

79.5 KB Created: 2021-09-30 17:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fa9f09079ee1afa509fea341d27e397 SHA-1: 8534bfc86d70744c9952bea89ae8eb9a9f405946 SHA-256: 0a00cabb925806be955452a2cc4b8e7c28877a015264d604157db5aa0f67c152
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://coretry.ru/uplcv?utm_term=java+lang+runtimeexception+unable+to+instantiate+activity+componentinfo
    • http://aarogyamedico.com/userfiles/file/rupanomavezovovav.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210925045737.pdf
    • https://immsac.pe/sgi_userfiles/userfiles/files/kamuzinulesefali.pdf
    • http://adance0112.com/upfile/editor/file/lesoroxifuzususobudoleguz.pdf
    • http://hingliltd.com/userfiles/8742936380.pdf
    • http://www.chubsorn.com/file/files/33735582493.pdf
    • https://preciseenergygroup.com/media/47565935799.pdf
    • https://dongphuchuytai.com/upload/files/99924737902.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16143a14de5910---gexeselisewemomanizogok.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/walegedu.pdf
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/dupixegoxex.pdf
    • https://poganyvolgyi.hu/userfiles/file/37312426849.pdf
    • http://avvocatoandreabruschi.it/userfiles/files/46722401183.pdf
    • https://eliteplacementagency.com/uploads/files/vojul.pdf
    • http://khamtribacninh.com/images/files/19449168476.pdf
    • http://nhasachthunam.com/upload/files/13478273247.pdf
    • http://eia-edu.com/userfiles/file/madosawenirugebirofid.pdf
    • http://garage-fuji.jp/js/upload/files/gepulubokewukusa.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8c9ed4e0---19249875410.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93a98f974---bavosabilazategijowuj.pdf
    • http://timavoshipsupply.it/userfiles/file/7850265699.pdf
    • http://syuncyoku.jp/upload/file/24175676845.pdf
    • 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_off0000c74d.bin
8af791f92428de70a840d8da4ce6f77ae6591217a8856b02f27b596397fd9a54
pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 11336 bytes
font_01_sfnt_off0000e1ce.bin
e30bf49a3d71e58671f852f2d2df6386db2c1562a7bfb2bc61258ee604aa0ccd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 20856 bytes
font_02_sfnt_off00011800.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 16792 bytes