Malicious PDF — malware analysis report

Static analysis result for SHA-256 80019a1f55c5d48c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 12:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b39f84b7fe58c9c9f5cf79c758f1829b SHA-1: 4bb6355bebbe8f8fd6c9c3756d6c2ced08f39ce8 SHA-256: 80019a1f55c5d48cfcb7f266eb0cf780dcf798a35b322b09256aa2e4a12205f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.agcontraincendios.es/ckfinder/userfiles/files/zepofatefe.pdf
    • http://bergepkolcsonzo.hu/userfiles/file/sereb.pdf
    • https://rgcsmt.org/ckfinder/userfiles/files/94291262198.pdf
    • http://vektor-bezpeki.com/userfiles/files/zepakotolitinag.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/24397862505.pdf
    • http://popnmusic.fr/userfiles/file/kitawevoliwox.pdf
    • http://technoprofile.ru/userfiles/file/gaxifodoxasapivezaxu.pdf
    • http://tjchenxing.com/filespath/files/20210913152210.pdf
    • https://ku4ysk-9lgp4y.com/contents/files/fuvebexofakuwamiv.pdf
    • http://myappartement.de/web/editor/files/18182334291.pdf
    • http://zezoalza.com/ckupload/files/69717591415.pdf
    • http://olgapolyakova.de/files/files/sajozipasigu.pdf
    • http://bunny888.com/ckfinder/userfiles/files/sesolud.pdf
    • https://kochitaxirental.com/ckfinder/userfiles/files/69874077635.pdf
    • http://industrialdevices.in/uploads/87946337464.pdf
    • http://cerrutistudio.eu/userfiles/files/patakuwulikeziwamesobof.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145cb153d34a---jipegadifesap.pdf
    • http://euroambulans.pl/userfiles/file/59062350600.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161411584543e9---xifisupepelinugonadipisij.pdf
    • http://96stone.ru/userfiles/file/samotexakuzazup.pdf
    • http://101balkon.ru/upload/files/kuzezatebedi.pdf
    • http://keitbg.com/images/files/jotalapabafutavi.pdf
    • http://druckmaschinenservice.com/uploads/fce/files/90597096969.pdf
    • http://metall-press.ru/files/sefapekeladexokubed.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/53727719069.pdf
    • http://japan-railpass.info/images/blog/file/75097682261.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4789e954e---dulufubugadigagopeb.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+the+fight+tonight+for+free
    • 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_off0000de84.bin
da1089e0e90094ad47f51e8903aa9edae9b850fa60e12abcc8b379de412e2523
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 17772 bytes
font_01_sfnt_off00010be8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 16792 bytes
font_02_sfnt_off000123ff.bin
a6c8379a014a6d604d6a8cb8d04719e70adf62e15e80dd92f3c3540a1022c627
pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 10396 bytes