Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc69f085c9ae32d…

MALICIOUS

PDF

91.7 KB Created: 2021-10-04 18:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bfb9d31533582639dade87b4d456fff SHA-1: 4b200c604c2241650c9fc258bf690ebc2d09aa43 SHA-256: acc69f085c9ae32d6cde5f5093a36074c7b22ffaecd7cca0f7f33131d8f408cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, directing users to compromised or disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs suggests the primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://netcentricnj.com/ckfinder/userfiles/files/38700968151.pdf
    • http://suphammamnon.org/uploads/files/54754969030.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ab2a2d7ad7---15128819347.pdf
    • http://orikon.net/Images_upload/files/fulepitigifanaxaj.pdf
    • http://www.childofafrica.org/media/userfiles/file/jajinudepebebesagikile.pdf
    • http://aybar-gallery.com/userfiles/files/96580331551.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/33814223572.pdf
    • https://rafaellopezehijo.com/upload/files/83735005892.pdf
    • https://adproissy.emailingmanager.com/uploads/editor/file/setalulubidukagi.pdf
    • https://onsale.social-push.cc/data/fckeditor/files/wuvudiwodo.pdf
    • http://asupuro.com/upload/save_image/files/vodajozosipotisokomuwi.pdf
    • http://greenmodels.ru/uploads/files/gefarilametibizogikaxe.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161376ecc6e071---demirusa.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343095c3a32---tavajo.pdf
    • http://theartofdesign.nl/ckfinder/userfiles/files/36007309598.pdf
    • http://emrc.ie/upload/imagecontent/file/66741655426.pdf
    • https://iqmuseum.mn/uploads/files/34650057495.pdf
    • http://nguyenphat.com/public/default/ckeditor/files/kikupivabuxewep.pdf
    • http://abwcolley.com/uploads/files/44544676670.pdf
    • https://gencshow.com/upload/ckfinder/files/nutuwepobipuletapenogi.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff1857bf9b---53937638129.pdf
    • http://www.salac.cz/ckfinder/userfiles/files/88041405976.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615681dad9364---miwufifemuvesodir.pdf
    • http://resetimpianti.it/reset/public/file/zifulizol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=vacation+bible+school+songs
    • 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_off0000fe6b.bin
0f5a737b6c4356a10aadae20aafa655db00c88d77c97ee049decf5725e291982
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 19264 bytes
font_01_sfnt_off00013109.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 16792 bytes
font_02_sfnt_off00014920.bin
34685f964bcc3670dca472b962ba6576c087131e00d45648eb7f805efa78d18f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14920 10516 bytes