Malicious PDF — malware analysis report

Static analysis result for SHA-256 320f8c151e290a57…

MALICIOUS

PDF

88.5 KB Created: 2021-07-01 21:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 353a33f5ff6eabfa8e10187c3add7080 SHA-1: a67d0139399ef6673a93be9b1b9abe7f865df6c9 SHA-256: 320f8c151e290a57215931efca2d2a618bb9058de5478f10e0928e1fc63a500f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs suggest an attempt to distribute further malicious content or phish for credentials.

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 http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee4072c3d---74854646244.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3e432fada3631ebb29c6477bfff464fd/50415457378.pdf
    • http://tnslib.su/userfiles/files/migejixademur.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/32544e110d62b9008bb985f07f2bf948/7600253189.pdf
    • http://twfindia.in/userfiles/files/59188211163.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/sozawegem.pdf
    • http://studiotecnicodavico.eu/userfiles/files/vufapo.pdf
    • https://avistravel.ro/userfiles/file/warifitolel.pdf
    • http://bellina.pl/userfiles/file/velagivirizupi.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/fd5b05faabcc1339a168da050478848f/togoniwenitepa.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920d894e1f2---wagorojabutiregar.pdf
    • http://vom-ragnaroek.de/uploads/file/49166153497.pdf
    • https://aawyx.com/sites/default/imageuser/file/towutibogefowevuwewamuvo.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0ej8m0eadriskrpn6j2b1fn4t3/49476538151.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/r2esbjntc5hv0ln110h2d1uvt1/56648668302.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd8bd2c2e---61056551593.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7c6e1ed7b---sexogoz.pdf
    • http://adance0112.com/upfile/editor/file/14367187251.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc5a49759---32716124989.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d41ce571---dusaduperutokozojo.pdf
    • https://lawyerupsmart.com/tempimg/file/95421754068.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca33c3c725---73247901215.pdf
    • http://pamat.ro/UserFiles/file/59259647922.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42e7779dd---10779028341.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=8th+class+2nd+lesson+questions+and+answers
    • 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_off0000f256.bin
eb1a48b4ee2329a85a7e5cf24cb4ccc101695339f5dce68e58ae1876f75ebf10
pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 11028 bytes
font_01_sfnt_off00010be2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 16792 bytes
font_02_sfnt_off000123f4.bin
68f3f8cfc4dcce4f7a78a127871a77c3814f84f44d1aa63ccad252918d8686ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 18120 bytes