Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f8b034ef517d4f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-10 19:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7119f8b6007aec5feac95686e574fa63 SHA-1: 758070a46a99e9984d509a8ac63c58da5895a699 SHA-256: 42f8b034ef517d4f1d4b4480921ed495a4beaa398ae22f816c3b47730c9fcb8f
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The presence of a link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence, indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kmnmt1b6952hfp7mikaognugv1/84709890125.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f2706278e373150f8d6c8b36f5a55770/57913506830.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/xatawojonerovizi.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/betesikaros.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/nepuvebizegelegiw.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/foguwemerabujezupenaw.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/83906201514.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/13155463756.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tovugidikix.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/razademuvex.pdfIn PDF document text
    • http://dsagco.com/Upload/file/noberokalanililapoxe.pdfIn PDF document text
    • http://sns.hu/_user/file/difetitubiluremolut.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909081503.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/51864210061.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/18181840413.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/38669271886.pdfIn PDF document text
    • http://land89.com/ckupload/files/dogokog.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/likegur.pdfIn PDF document text
    • https://ags-car.com/upload/files/7890751100.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/jadasijatupediborosisober.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/fujuwanibijafakopurinax.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/20818343838.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16135356c98517---xujijugat.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612fccdd0f825---31693352165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gta+5+download+mobilePDF 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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 17888 bytes
SHA-256: d9ee341d69f600b8eb7280ef02670f7435a837ff56680e125cab265d42ca9af5
font_01_sfnt_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 10540 bytes
SHA-256: 7834e9f6b9a39e4d6159727f4431eeaa5a83de0ab6ff5798239229e769fc5769
font_02_sfnt_off0001333e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1