Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae3a2543010f024…

MALICIOUS

PDF

77.8 KB Created: 2021-09-22 23:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b7c15dea7f99f6c16bdf30fe1c6ca93 SHA-1: 4da8b9a659b1acd0016647a05c4cc19f707c39e7 SHA-256: eae3a2543010f0247d9deef69c13a98728bfd592b037c5e1e44fee63e2b479fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm directing to multiple URLs, some hosted on compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The document body is unreadable, but the heuristics and URLs strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://7166867.ru/ckfinder/userfiles/files/fojofafenaj.pdf In PDF document text
    • http://local-minicab.com/survey/userfiles/files/wulipuwazupikijig.pdfIn PDF document text
    • https://digireg.si/upload/1216632801.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/27831325177.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/43c7b78c3429f1680f63e987fbf1689d/65770879891.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2aad0d7a6---88742227946.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/gobamag.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/40204209496.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/15824201075.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/maboxojavitotifuzumo.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/rukejozigovagovoz.pdfIn PDF document text
    • http://podushka.by/files/files/bebavisutaxutid.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/71836687611.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/be53db38be57aeadf3933f1d6bd6338c/tibeletobofivubunepakag.pdfIn PDF document text
    • http://w-mill.jp/images/file/gobedaleke.pdfIn PDF document text
    • https://petribax.com/userfiles/file/18780796614.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/tikirekuredetimojidev.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/rulifolod.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/60089066300.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/8515647846.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/4498819364.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/didaxiripaz.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/72297904609.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/65897753465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ppsspp+the+sims+2PDF link annotation
    • 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_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 10104 bytes
SHA-256: b15b9f0b18cf17d965a5bb3fb5ee2c899bd5661767ff30b3f91e8b5104569ad9
font_01_sfnt_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 19528 bytes
SHA-256: 34e50a33ed19aeb23e81a3bd5d330505bbf0a48ceaa5c7082e40c6d36dbcb4ea