Malicious PDF — malware analysis report

Static analysis result for SHA-256 22aaedf95f513e4d…

MALICIOUS

PDF

85.1 KB Created: 2021-08-20 14:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 09c311f04a185242fba20358fb718a38 SHA-1: b852d7bc7728d4d8e051ca1ebd7d2b6081931d04 SHA-256: 22aaedf95f513e4d67a08b23f72fe01a6783055816088bdf8e1c7b854b25dd72
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by multiple heuristics flagging it as a link farm pointing to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to a malicious site, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cardion.dk/gfx/fckimages/file/zobepukinefil.pdf In PDF document text
    • https://majorsagilekvaros.hu/uploads/file/mewubosefeturonopota.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/gorizitofapujufitupilavi.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/ae440118c0b5ffcf0fa400954ff85cfd/ninusuwojumomujug.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/xomemoxakakukoravewu.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/vezemugobepuzi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160854b8dd3318---53112619421.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m3b5s7ncj77ld27m4vbcdefak7/38145792706.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/9371638104.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/98b34916eb6a0905193040dbdef2e42b/wefidobepi.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/78259636705.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/donopawu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/78cb31cf948bc4c6e85313ff4ab26dcc/pojivodifolifod.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9km9vt23g08jdha4h5ts9a4onl/perexed.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/lozepe.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8ad37896ae19f89deaf1ac1cc82be0c4/4643543464.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/46086313542.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/lejujisumuletide.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/83809431209.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b23dd876c1---54618181361.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/xazenidagiwizovibof.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/54842b801d609ef39cf7bb5947a9af55/xoweb.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/88948807355.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60b358bda---gipapiruzepupetudiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+pair+skullcandy+wireless+earbuds+indyPDF 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_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 17500 bytes
SHA-256: 7e3c345ceea746edc0b0dff39fa1ecf488f8bc243326c8d805bd8859028ce059
font_01_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA3 11032 bytes
SHA-256: 5ae4fbe15132d7ac10dc1818d2d7c1a1e839f03a7db443fc3ae17784bb68ebc4

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