Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2acd6e8e16f4547…

MALICIOUS

PDF

99.3 KB Created: 2021-08-15 19:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4dd9362f7d238c57daf3a662f163d5dc SHA-1: 4211796de0bc07c517bd91c55d966bd90702d49e SHA-256: b2acd6e8e16f45478f172d144cad6bdd6efba71fdce0e46a879f7368048caad0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786246cce14---38731097982.pdf In PDF document text
    • http://lavalnerina.it/userfiles/file/sinetizodof.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/joxezukumed.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/46461104766.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/32835550073.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3d853249a557b783777ba0b2edfa54b4/sizodibupe.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/xugobalafadorufododuke.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/63260620483.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a90e3fe3297df647f5fd03ac6e42bbf7/xuxifamelaladuzonotefisi.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/55049725e9633f7f68b87afeb8d604ae/vijisuporizuberugilagu.pdfIn PDF document text
    • http://simoncaulkin.com/images/36354028714.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160779b9315678---3840024566.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b00c1d07bd3---kazogokixafedikixeti.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf931b205---pakexafupejub.pdfIn PDF document text
    • http://royalgroup.at/tmp/sedesonodafigotos.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cd35a18dc---zuxexajuwa.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/29177516968.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/65223827811.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/dikilagi.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a481515e39d---wudusasixalovazuf.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/tugutenob.pdfIn PDF document text
    • https://cristalensi.com/public/File/bomed.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/fopezifosomelar.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/miwomiviwamowo.pdfIn PDF document text
    • https://carlojans.com/cms/file/bivavudodapajazipafiwakex.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7c9c4984820a53f74497b23866c8a64b/50517158920.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a96e1a2ae3---lugunumedagewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+write+a+reference+letter+for+someone+applying+for+a+jobPDF 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_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 17668 bytes
SHA-256: 682958f8413b2b75704718c247c3940f623d9abc1593daf4b20e3a59a23244fe
font_01_sfnt_off00014c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16464 11284 bytes
SHA-256: abaab8b347a8e493088108c49803af6e6e89debf3636911d47075fc4c49fb3a9

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