Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f34e553a3ee41b9…

MALICIOUS

PDF

102.6 KB Created: 2021-06-27 20:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55ba67466fb727ce7c0e60e20e58f2bb SHA-1: 9496165e13bdd5144dd5da1d99763ecc7f48eac2 SHA-256: 3f34e553a3ee41b92ff722e094ef44924b5a6bf40cbab8213599fc7c4859df2a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://szabobuszrendeles.hu/files/files/jewativo.pdf
    • http://andreaslasnik.com/data/files/noritipegoxikiwut.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kk0siph5jkvl0pfpbg9961vo50/22925920949.pdf
    • http://www.cddfct.com/up_files/file/lasikerimavojasogi.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b338f6c5b47---bakotakuzavojo.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081809c7b850---wetiwolimife.pdf
    • http://flirdining.com/uploads/files/laremivusugukidib.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/46fa9a937178ef7c934a08d2585d34ae/31268088160.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/wulunuwifixuwikino.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ccd424686---87218343618.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/a86a9b33ec38a4e5f16c80ccbb1efa84/49656896550.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/g4mp1i2kk2iveip7cedicao9hu/pusukeragumesadaka.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/aca2c6e869ea6ef2c6ab03418c80efce/kadukovinisajekurisapule.pdf
    • http://latexindia.com/userfiles/file/novigunejisuzovapajesu.pdf
    • https://alakharia.com/public_html/userfiles/file/sobisim.pdf
    • http://bogelaipigeon.com/upload/file/89717756309.pdf
    • http://akkoryazilim.com/userfiles/file/jagisamozox.pdf
    • http://vhshf.de/File/89977284343.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/41254f9d01910307c4d30901535b43f9/16651853539.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d0461c3fc4f36929e8c9a6fc3612893b/57605177624.pdf
    • http://blessingsngo.in/userfiles/files/sozawedabi.pdf
    • http://grgct.com/ckfinder/userfiles/files/26243410942.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d74086970f1---79516181518.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608366932cd1b---20489137917.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=reverse+card+from+uno
    • 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_off00012c29.bin
03c28405aeb752ac3f6d2e624c115d2e541b37fa357e175353306c6475b4dc14
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 18400 bytes
font_01_sfnt_off00015cf7.bin
f19fdb6d5e9aead29d2015578019ba875c166ef72c55cb1488e7eb62f01486e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF7 10612 bytes
font_02_sfnt_off00017545.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17545 16792 bytes