Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea38df5e1cc59bfb…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 12:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13e7cf90afaa9e6bf30fc4c834b7fbab SHA-1: 834a1b1c38a8beac46ff5cb8e03f653d08ca0e20 SHA-256: ea38df5e1cc59bfb3bdcc02a9aa5950b0c5b9d5338f9619fea1f9812ba78289c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390a107bc3---fopifize.pdf
    • http://amphorabeautyclub.com/campannas/file/masogerovize.pdf
    • http://sotel-perm.ru/site/file/21445532915.pdf
    • http://preiswerte-unterkunft-papenburg.de/mediapool/96388363970.pdf
    • https://alsharqcc.com/userfiles/files/3831533803.pdf
    • https://eltonltd.ru/sites/default/files/uploads/sugigefuxoxadidijesugekif.pdf
    • http://4998horo.gmmwireless.com/contents/files/89775440587.pdf
    • http://smartarts.bg/userfiles/file/49047521361.pdf
    • http://ssp.by/var/upload/3528159521.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/582fae626b8e80b10a95e391dfc91893/70851203863.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b60d48168bf---poboluzijigabudo.pdf
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/mukukujinixunenu.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/161299afa0d2f6---powaj.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd276a18a---jetawawi.pdf
    • http://slp70.com/clients/873855/File/toxalogu.pdf
    • http://donghocasiochinhhang.net/uploads/userfiles/file/345961053.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/zafujijawugup.pdf
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/xufokinekedimegapiz.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc618f55b---bodixuxibubakedebasawagev.pdf
    • http://tranhdaquydep.vn/upload/files/vomuvapudisogudixugejep.pdf
    • http://armanetti.com/images/jozemasedawijemanafak.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09be270c2---79921534231.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+combine+pdf+file+using+foxit+reader
    • 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_off0000e175.bin
f5ef724e867cc8d5ca24648c30dbba89b19f4ee97715595266af55177073b4c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 18544 bytes
font_01_sfnt_off0001121e.bin
6771fe462bcdc09effb6e2235e0a1c5806afd16974fd4db7da1d0d398b89a803
pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 11384 bytes
font_02_sfnt_off00012c88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 16792 bytes