Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa0847c7c9af5ea…

MALICIOUS

PDF

107.9 KB Created: 2021-06-28 18:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c43ffb0f483c36eea5da6c06db026ff3 SHA-1: 666014ac051d9ef2afdabd93da227cad27340181 SHA-256: 9aa0847c7c9af5ea8b140a8913c8d8a2ec51ec87dfd01558b1ef44ec574cea98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.gesas.it/media/mailinglist/file/28765262611.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76cfd68e2a---83145728885.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/14defcc7c89d84114226b4e6996842bd/tezan.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa38b19a505---19752969287.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/ce2949a07c6ef75b2fccf1ac5aa7cd20/ranesugoparatelizoled.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/duxazesodijinekadusene.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c03fb00a249---debegezalojobewujaxe.pdf
    • http://enotecagaribaldi.it/userfiles/files/77328475040.pdf
    • http://er-trans.com/img/produkty/files/23038269330.pdf
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/jotizu.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/11e11fe643c13b6d28b5ca09621d5b3c/davutegezuwojorajaveto.pdf
    • http://alexlunacoach.com/img/editor/file/97589959510.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b168a1941fa---womunakejibukomofela.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/410e20d3af61c91a0c6fa92bbb8e543f/29444897627.pdf
    • http://santamariamikado.com/uploads/files/xujiwod.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a944068cfd6---67044711837.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0698a106f86547ee3b174b4eaf239276/gegipij.pdf
    • http://voszveszprem.hu/_user/file/29815764774.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5547daff3a554b4e79bd710195e8391c/67463981939.pdf
    • http://andlupa.com/userfiles/file/6119087805.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b6b5306b54a0a5946f62604d73463dd1/kivamewexajuxozojifozaliz.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bb57d55b3---35540619452.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e95bd90f1bad45c0044b9e66a6f66f7e/katijenogamukanesoxabajor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=humanistic+psychology+theorists
    • 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_off0001439e.bin
9dbd207187eabef2fcba2eab8f86069a52cc556c5d21661012628c0f88670bd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1439E 11024 bytes
font_01_sfnt_off00015d15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D15 16792 bytes
font_02_sfnt_off00017527.bin
4ea6c955530f40cc267c95b30a65f6a57651a2932a058f1d3341f268d83a371c
pdf-font-stream PDF embedded font (sfnt) at offset 0x17527 17304 bytes