Malicious PDF — malware analysis report

Static analysis result for SHA-256 101f63cab719f74d…

MALICIOUS

PDF

75.3 KB Created: 2021-07-13 15:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6aebef1e432de1100386e7580d7392c7 SHA-1: 118f068dc35211ce8177e4f403b2cf7b5aac1a00 SHA-256: 101f63cab719f74d1c3bd7ba46ca082ccfe78e5327b3d52ca7860c69666ba71d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://nomylo.ru/uplcv?utm_term=variable+is+uninitialized+c%2B%2B
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/9ea4d25f0a8c577980f132412916b879/89579558480.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/94d05740cfa2ebb89bb0d0b57004ea37/dudumunaniwuvuremiwuf.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/85d179168bc547412a038226f206ba29/784410810.pdf
    • https://transmar.biz/ckfinder/userfiles/files/nuvujojalesadebezorol.pdf
    • https://motty-etai-sharon.com/files/files/potapizuzivawafajuginok.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8925fef26cc84ff807494b671bbf39f7/gafotumedu.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//1031279491.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3747401b86acf84292e91a36947abe90/rojor.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/28019784267.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0160c46f1---22499887864.pdf
    • http://pandoreunion.com/clients/81456/File/guleputano.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ba3f4bf5226d340cb2db2c18f031a3f0/xewisafazix.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gjfi2ttouvbc9fu3u5rl83od8u/45465287418.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b920b9cb7f0---gozifatage.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607286c947674---54500918960.pdf
    • https://egf.tw/test2/images/file/79545943045.pdf
    • http://grupopiscis.com/upload/files/67557670340.pdf
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/lizarisedukovokanujazumef.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160730c031eb9b---59148618707.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/daefc290afb5df18c776567f40e69f7e/52310429392.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9ae54f379644a947f7a4759d7ff2c634/23768552551.pdf
    • http://arniestribu.com/campannas/file/84148134296.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/06938ad23cefe52467f1292376966c81/79261052586.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/be0575ed6a07d225e330767e276ff187/95355509419.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/07723df795e056b33336e7f0100c24b8/guvusetivodod.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_off0000c316.bin
7ca625e4c07ebd2f5df54fa7c8a38bcfe0e8b0b17dcfa3d309c8a6ce04ca7bf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC316 10512 bytes
font_01_sfnt_off0000db2e.bin
3c36d0804302a1fe3ff6249f61881c275ebe1500c634c8cbb31539fc3da5ba43
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 16992 bytes
font_02_sfnt_off000107ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 16792 bytes