Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bec0354a9172471…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 03:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 399e41650be8e67dc3fce9332023bf7a SHA-1: 5e79bfe1de59bb0a7e9730d9891b85610dfe20b6 SHA-256: 8bec0354a9172471d119cc66f1ac9e08de6ba1a786a8d26c4db30437f74e7e29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fdee75214---4696881141.pdf In PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/xonidipedimugowajezo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/806f0550b81c1261bcfc93df08bd8d11/86659025038.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fb55cb7814705f087bb64784c4a38853/desebotezalabevevek.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/11740816373.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b874e1631---94064204006.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/99603431830.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7edc2019ea5cc3430546e36592907ac5/juxataxovo.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/2842662886.pdfIn PDF document text
    • http://classtool.info/upload/files/vufewiwune.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/xinawa.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/xaxoravewapikupeziwab.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/71cd92975a3a62a6d0cee62a49235832/pejut.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/julujosotule.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b9666d1b3---61832728787.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/62722029340.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/namixijujigewovuji.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fa6ad0f3b---61935625117.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/rujevep.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/jipixupulilusa.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/22339857023.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/77213826457.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/5351424909.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4c5baa36---14940492614.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210803041450.pdfIn PDF document text
    • https://arerp.kr/data/file///75589492383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+many+worksheets+can+you+have+in+excel+2016PDF 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_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 17932 bytes
SHA-256: fb5870c0f4fce39a4eae8d0ea82a74ff254f8285adff3831611d880dce07ca93
font_01_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 11508 bytes
SHA-256: 18400388674a2bc6f3ac7e37fad1c9d7c0c6f5eebc60a841fe4b77b965f00601
font_02_sfnt_off000137fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1