Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb4fbf715eae4f1…

MALICIOUS

PDF

85.9 KB Created: 2021-07-09 19:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f719e788d48ddf08ea690455f93e3bb SHA-1: 26ee3c03ee3a71259e33b30df354c56d680224f6 SHA-256: 8fb4fbf715eae4f18ed4da9ed90c8d5aae1606c2f9df1d878f4b8f209f1d448b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of external URI heuristics and link farm indicators strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce536454439---23132924497.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073868f13bf3---90590378221.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/bbt28j949ef6bpb2jfccnulol1/fusutakufe.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/lhfgur9bujb041houa8ec2jk92/lowutapekifavadugerejate.pdf
    • https://amatnieks.com/pictures/image/40771918496.pdf
    • http://zrdb-drogbud.pl/Upload/file/povoduverodiw.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/15640585612.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/89343021763.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c668267a811---lovejutizut.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8fcf6905f---pakozinuzi.pdf
    • http://nuraski.pl/wsg/userfiles/54919513512.pdf
    • https://alteanetworks.fr/img/file/51480553912.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a022ba0e4abb7d09e9478bead3c69303/44466923732.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e41660b3a---86492882740.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b90d2430ef8---42708526352.pdf
    • http://bike-aholic.com/UserFiles/file/terov.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/4d8e19d86cb3a344e4e09641aaf0da3d/vezotafisutugage.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jgr3689j8u9lid119t8tpb6254/88809375666.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607368eea797b---87269721608.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/57473233e56a919b6fb3e9f8d5096c4b/vimegarajabumiximas.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/632b8be8f663604b2c13c70e1d60e831/82260302333.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/8qbdac7214n3cl8vjepsfuae9j/99612949729.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0675d54630289d84332a0ba01f183704/gukanolux.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=geometry+dash+2.1+noclip+hack+android
    • 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_off0000e67a.bin
016dede81f16cdc27a2e91d5e4595023c6283bfcb8a932f4305fee8c5180cdf0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 11264 bytes
font_01_sfnt_off000100db.bin
b4cf002094328551b24fedd6976ea836f0011c02136d3352c8159083561c27c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 19260 bytes
font_02_sfnt_off00013063.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13063 16792 bytes