Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0518d092a01d99a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 10:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 431d2b49fa2ee76de4fa4f021d56308c SHA-1: c7c2b5916b7164710c30098180a04b5fae96820b SHA-256: c0518d092a01d99a22e72f706f00ceb66a8e32a5c588cb26b8105bc08a799939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress upload directories. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mpksieradz.pl/upload/file/kedaxopisenijawutop.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f705e55f0f2d112ca318d44dbd92a48a/romule.pdf
    • http://nowyhotelik.pl/userfiles/file/15178869622.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/27168df7a902b93fc4a98c4d33e2eb0f/2636710924.pdf
    • http://sahrugs.com/userfiles/file/58683275836.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b40dcec0f0571a461c133138bd3c9382/32388787632.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/jufazobaziwifojexa.pdf
    • http://adveotec.com/img/file/60695113899.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/84766308365.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/86383433690.pdf
    • http://easytravel63.ru/ckfinder/userfiles/files/15799023197.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ruauds9ab7buktqjr2t5gm3lof/voturepipuzijagurif.pdf
    • http://kientrucsangtrong.com/plus/files/sagokixubexatedivuv.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a9089ed7d8d43036f7a0f355f9396800/92711459048.pdf
    • https://yourownadviser.com/ckfinder/userfiles/files/90781249386.pdf
    • https://iword.de/userfiles/file/gebasewokiwuzi.pdf
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/27682146639.pdf
    • http://52fotki.ru/ckfinder/userfiles/files/54346529861.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d6d91c1a9527ddcbd9770a5da818d162/mibipovorukasuserenopuno.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9p9fvhqim0a16sroho9pl6fufn/56548914805.pdf
    • http://poslovniimenik.net/firme_data/files/93101493510.pdf
    • http://chandigarhdatarecovery.com/files/file/41706828386.pdf
    • http://thebankcardservices.com/uploads/files/54981329720.pdf
    • http://olguanaokulu.com/upload/file/fefukafegopeje.pdf
    • https://addsfly.com/userfiles/file/26510515639.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+does+a+spider+eat
    • 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_off0000d808.bin
9f60aeae43f842e6cfda29ec2fe5bf16f0010570bbea23da75483f4c8dfca457
pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 10312 bytes
font_01_sfnt_off0000ef69.bin
7faf4de0918b914b0a2974aaa6f626a191ed09c85c6a28789353c8e86c3de586
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 16688 bytes
font_02_sfnt_off00011a49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 16792 bytes