Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7aa3974eb10739…

MALICIOUS

PDF

89.4 KB Created: 2021-08-08 05:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78b13b30e3e8ba5d52c6a83f098242ba SHA-1: 260e35abc55252237a3d2ca2daa9152f6d73c44f SHA-256: 2d7aa3974eb10739369f541a34846766bf75f185385619f6206982ee34c5d0fb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and link farm nature are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://archism.ru/uplcv?utm_term=fabrication+d%27une+girouette+en+metal
    • http://gptools.net/userfiles/file/53030176951.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609df2eba9aa8---26166364663.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce7c5ac52---saxukawoseduka.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2ca0cf8cefc0906b01d11a6ae7c0316f/95963002917.pdf
    • https://dolcezzecaffe.it/file/masogezutiguxamitojiko.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o80q0uhntdvjk28jket12e4kjg/29314605682.pdf
    • https://comillaspostgrado.es/userfiles/file/vigone.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/99089403575.pdf
    • http://www.hgbehringer.de/img/files/files/69108522407.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/jinukil.pdf
    • http://bkmarine.net/ckfinder/userfiles/files/1626390769.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5fe1f025---wugapuvusarulosujatanamub.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/75351197359.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160882373273fe---texomufazudozevexosuxud.pdf
    • http://franciscakeryandcatering.com/clients/61981/File/tosezubusigiro.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/wejopolabikuxepaj.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/15605079469.pdf
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/joxetusuxipax.pdf
    • http://elhammagazine.com/ckfinder/userfiles/files/velepebojuxujumotakurevu.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/f8v4i69f3e83uhjiqoh15snssk/26118040143.pdf
    • http://unsersohn.ch/images/file/tituke.pdf
    • http://greenworx.eu/images/uploads/files/putabisefedepevagosil.pdf
    • https://cargobull.cz/res/file/lerozubikenepeximonemiwod.pdf
    • http://cn-junsheng.com/upload/file///202161981547157.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/fc4c3f74d67ea625a0be68efafb04d6c/35090961855.pdf
    • 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_off0000f721.bin
376bb0fe68d8acea445fdac82bf3bae1e9776b685c934716389e8dc8d8852138
pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 10796 bytes
font_01_sfnt_off00010fcb.bin
423f5960a3987fc17a5f16af93b2c360472954b42dfa9e0344324c15c4864265
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 18464 bytes
font_02_sfnt_off00013d7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7D 16792 bytes