Malicious PDF — malware analysis report

Static analysis result for SHA-256 478df97d574d0373…

MALICIOUS

PDF

84.9 KB Created: 2021-07-04 07:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f1a863893fb6f6057c033adc4dda40d SHA-1: 579e8702f0047b2cc5901cf8be67b60528d44bb7 SHA-256: 478df97d574d037336f3728678f909048dd83862c5a47cae29ae8cffce30753f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external PDF files hosted on compromised websites, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ikitellirezistans.com/upload/files/30748551380.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/409d5672e8e2c6de8287253065f44552/dilifexasuxupewuro.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b1b08988889d8487c0ce9e66ccb65ebf/tosubozepa.pdf
    • http://kashima.cc/userfiles/file/sekimexadulibobularuga.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e78db6a5c9---xopoduduratakugu.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c49b20c2c---vuwibi.pdf
    • http://alexhofford.com/temp/files/file/10927560824.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878387b118a---bemevelisabap.pdf
    • http://allycatering.com/userfiles/muwonuwaponolim.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089afbb14214---bujakiledebomemafemoxep.pdf
    • http://palami.by/images/file/28524684882.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/14d602cc4675e7eefab5242abd635469/25290871620.pdf
    • http://swaminarayangm.org/userfiles/file/rowel.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0a96534117db5b2f38587cf5e8a8211c/sijekenujadejoja.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3d162a6b6---74781952017.pdf
    • http://100gastro.cz/soubory/files/74289423702.pdf
    • http://aviatechinform.ru/sadm_files/zetabazumu.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7910181113---nozazexaziberuwufewozu.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/43dc1826d8cb00f019017ffd537b5ecb/77164231286.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/25213359352.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/0q9u0i5ahopfe7cnf7h33fk7e6/jigexijedobiwasedavomose.pdf
    • http://etcad.net/np/upfile/file/papapusulenubudibape.pdf
    • http://acpiindia.com/userfiles/file/vaxezedugu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+deal+with+a+difficult+customer+interview+question+answer
    • 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_off0000e911.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 16792 bytes
font_01_sfnt_off00010123.bin
0c64e7491811dcce1c7e345b689083d10970e3678e85d9bf09e51e747275bfdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 16728 bytes
font_02_sfnt_off00012c5d.bin
da212d1142b906509e8a2404f25b49dcbbba343371bc94cc1d141fd4729522af
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 11128 bytes