Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ae42581488c34f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 07:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 895289ac14e0118cc1f83726cc91ccfb SHA-1: 21032523fc1d23149390b516527df68c38f5b6f3 SHA-256: e0ae42581488c34fe4103a00f7e84e09593898d5b21beb13cac595ba9487e835
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly supports its malicious nature. The primary attack pattern involves luring users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=mh+cet+law+last+year+question+paper PDF link annotation
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/12348778a902a89600270f239fe09b80/kemalejogatekedavorekato.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/13705315930.pdfIn PDF document text
    • http://clingac.es/d/files/duluromukebamelidagor.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7915090b---budunulovenatapopumapam.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/70019763715.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/mobemi.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/69713666611.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/taun1qkk76g87pk9hof694mpu4/40778697421.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/25430fe360049b5a89901f704784d6ca/zisusiwapaz.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/51056510161.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a11337b9a---ragejezulorutuzo.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/a1nrl3107uc4h8nl39a3ehudi2/pakawofujep.pdfIn PDF document text
    • http://landia-print.com/pdir/file/kidanosuj.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/11992791801.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/u0bb7hubmrqhdn5covn21psou0/xudunagegagigi.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/fixiwikoxosutax.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/30gtn9eao7fiungp71fs71e3d2/renonow.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075517b89e49---rolujalir.pdfIn PDF document text
    • https://aashianarealty.com/file/pejevigemenovegazik.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5d2dccf7cc7ad8f391b05425d422878f/34140513769.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/tebujejefiladibotituso.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/wuvalutuj.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/lopadas.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/69642357088.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ldc8oo0uu4d1fhgild9snbusr5/jebuturotof.pdfIn PDF document text
    • 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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 18744 bytes
SHA-256: e56b73742c37961ae039d9160000e9f36e9ca88c8a2c01e37e6859010d961177
font_01_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 10908 bytes
SHA-256: 71ba6c05ba06dd66222c02fac79a8b4816ce59c9030140e66e34a4d4c4e25a10