Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e4746c5f45445c…

MALICIOUS

PDF

106.6 KB Created: 2021-07-02 21:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ecf63c9272958ff8c194d4d4b57215b SHA-1: 9a12cae85bf9129b9bfefcb6060bf750ba5235ef SHA-256: 04e4746c5f45445c9c9489e68dfaa31992c22bb68dd03b3068068805d8f17af4
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely to lure users into phishing or malware downloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e33f655030f94b8451ae43e1eac2d6ba/bexinipigapi.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160db1c4b8710e---pegakilorid.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s1lnb31mqs4oea4fhekd89m4ri/jepogotodilurizefodip.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070140888278---toliw.pdf
    • http://protok.pro/upload/files/63328487019.pdf
    • http://furniture83.com/upload/files/78301206187.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ca1224ea17cddf917fb6f2095ca5cafc/sipusofumujumaxuvowigaji.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9c697ae5b071b135d9ec25d6b5a09045/wajosukesajowidadajejof.pdf
    • http://gyorszol.hu/userfiles/file/sumugetizowubutamizaba.pdf
    • https://planet-for-events.de/userfiles/file/66004650699.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/3a841519d3657ba7b0498f9762b4844b/sowaburer.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4105f8cfb5---matozomibumofiwo.pdf
    • https://noithatkuongthinh.com/uploads/files/35921265934.pdf
    • https://anthonygillant.com/userfiles/file/woguj.pdf
    • https://tecnicamistasnc.it/file/sulovavoj.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc45e40890---78185045036.pdf
    • http://loveperfectionschool.com/upload/file/33835688478.pdf
    • https://carparts-fixture.com/file/file/pedobolawosufuvokolij.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607353a92e3b3---31656563343.pdf
    • https://rosycaffe.com/file/bipib.pdf
    • https://medtek.vn/storage/file/xizusodujexilisasesupi.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c66d7af0d96---lowisuvonoloxatexugadawus.pdf
    • https://oteaexpert.fr/cite_imgs/file/70994027761.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=blood+relationship+chart
    • 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_off00013bda.bin
a71460abf49299456376e3eb1d852799dc4cc508d18f00c8a1b5fdfc24e4be7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDA 10664 bytes
font_01_sfnt_off0001542d.bin
108098875939fca746e905eb473472942c8557f3ea2f7e4e22e5911d862beedf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1542D 18620 bytes
font_02_sfnt_off00018531.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18531 16792 bytes