Malicious PDF — malware analysis report

Static analysis result for SHA-256 f168ed84a2bd01e0…

MALICIOUS

PDF

84.3 KB Created: 2021-08-30 03:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71cc811a0c7a5a14522c55dcde803225 SHA-1: 37c9a3336a4e108b5067f4024ef4da3bb7a7e459 SHA-256: f168ed84a2bd01e0a1d23273c70b563f37602e5bc29a0ccfc9ad4d6af72a03ce
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded links, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms further supports this assessment, indicating an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=short+sighted+and+astigmatism PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54a4co2fvpq651k0j7lj5ddp26/mufed.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9606571535---83140282851.pdfIn PDF document text
    • http://kgmda.com/upload/files/megunaru.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/70583173717.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c959965fbb---28173133475.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/ledipakado.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/65681509927.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/63388847978.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/dirikigimox.pdfIn PDF document text
    • https://atl-50.com/files/file/11548778055.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/58dddfd2a14f89ee2f03b0ca3f963178/35265929790.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608503c98b2f9---24056650834.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf493222c---68432729711.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/rizizigipanapaxim.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c04fdad710e---67523196154.pdfIn PDF document text
    • https://rcot.org/userfiles/file/xokawepeketidifezoroz.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/97548100657.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/33201568914.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1linnlmomtc4e9cg5u6m7hbumj/lobagozutasetigi.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/kisasagaturisas.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/46711477096.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49722c1ef7---72187647248.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160710a193708b---kukatonugejotu.pdfIn PDF document text
    • 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_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 18260 bytes
SHA-256: f7d886e8607974fca3aa04ca0d9a7e4287955746fc92d9d8cf9dc3521347f03d
font_01_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A76 10724 bytes
SHA-256: 6f35bb2078fa273d847eca5a10efc7ec7da23efc54c8b2be52071762a635a527

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