Malicious PDF — malware analysis report

Static analysis result for SHA-256 7508a45f63d516b1…

MALICIOUS

PDF

128.2 KB Created: 2021-06-26 00:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dba45096e07b5a861d832a5a974c5e49 SHA-1: 85237249fd11f405fe411b68bc99408c8217e867 SHA-256: 7508a45f63d516b1a153cf499abb41bd99857454b3ff600e9b48a7e0f5fca0cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 https://laborke.ru/uplcv?utm_term=wheels+on+the+bus+chinese
    • http://beiwendq.com/userfiles/file/bajibebawofapuxuxivegi.pdf
    • https://artasedanasingaraja.com/uploadfck/file/97817854082.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef1a8472e4---23153940219.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f2c72623---55481726187.pdf
    • https://faprosid.com/file/rikev.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609855609b3ed---27893364364.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8138e172e2f11d0ef71897dc1fd6b9d8/podenarilejajosejibulef.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dbff1683d---nevomepefemafidafu.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d536ddf82---94210987361.pdf
    • http://veterina-hrib.cz/user-uploads/files/49987487854.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/264df6864e45284becda7515e2f84237/8644978756.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05e75704d---32798795257.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/1f325b6d142171f14e83f18115b56f6b/63669936496.pdf
    • https://efnnma.org/files/file/86076263471.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf123c0a84---fuzesebegibesowipuvirokos.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2137c4f981---zizedumomax.pdf
    • http://apcmagon.com/userfiles/69561983719.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08b351d1b---95728140442.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096641ec35e2---jekedixofobemebemusi.pdf
    • http://www.contectrade.hu/fckfiles/file/16037384853.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d863f1c9d61ed0f919a8d6fd915e04ab/bunakizamunerukezifiro.pdf
    • http://grawerlik.pl/userfiles/file/17532312286.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe36.bin
3e2bd68d330c79922a0faed734aec6e49a4d26827bbbc79e4068ee04011b64e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 19408 bytes
font_01_sfnt_off00012d10.bin
0d2b6bdab9d7963e94b45386c63132d4d6c7436c69f2069d3f58d17d5ce6d6b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D10 10300 bytes
font_02_sfnt_off0001443f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1443F 16792 bytes
font_03_sfnt_off00015c4d.bin
faddabc9df4b454e07f3cd2098b88a97a1af4970dd52301401365009878720c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C4D 58304 bytes