Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1003c684c513d7…

MALICIOUS

PDF

88.1 KB Created: 2021-08-09 00:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b27e5b5643bc1df812f48fd671b1881e SHA-1: 24bdd53e5f18c52d6d4fa0c7d956a12ffbdf58f4 SHA-256: fd1003c684c513d761dec30392179a702886f59f1a1224d5f19aebb0fb6d9149
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of link farms on potentially compromised CMS uploads suggests an attempt to leverage legitimate-looking infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://consulcongress.it/uploads/assets/file/41285274840.pdf In PDF document text
    • https://dbmotorbrokers.com/userfiles/file/visegumutijikadivomesej.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/punikopanabi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/0b0jbp91e4228a5idcn9rrn5me/riponulakowuj.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/92960306492.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9298da668---wotupopujedejipuxijalor.pdfIn PDF document text
    • http://bkairconditioner.com/uploads/files/27161671952.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/javife.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/22632358076.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/nerizitumux.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/sikogatik.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c068886235b---86602220473.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/motetapesuwolude.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/wubokezazujopekubijef.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/64400494450.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/b7309214d246fc0ab715efec7f3f806a/72208813119.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jikefifaferezibolej.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e2fb95f9---21406141533.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/f6231022bc6ee6493c98a6f2fc32fefe/zirabag.pdfIn PDF document text
    • https://7gking.tw/upload/files/48652872822.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/7d1p4u08d77lmu00q2rj2b1pa9/78484421185.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab956733d7---fizokisajuduzaxubikimu.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/a28s23aq32e4t8evqfv61qc2u8/dozobimiwulazadebadudasiw.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/dcfd7c6074244e0a6d54e03d9fff44eb/zararowuwifek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bohemian+rhapsody+piano+solo+sheet+music+freePDF 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_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 17612 bytes
SHA-256: 088f526eb6245ed71c91e4e89867ef98f8e222a5b8f6db8d112bf478ebb49857
font_01_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 11152 bytes
SHA-256: efa64c905d7e6f74d4fd1334d75a4e7ccb17ff84dfcb230126646ab785ec2b2c
font_02_sfnt_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1