Malicious PDF — malware analysis report

Static analysis result for SHA-256 7979cc753460241b…

MALICIOUS

PDF

89.8 KB Created: 2021-10-05 09:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efc8689dc3957263ce748973175c8b78 SHA-1: 06bee57f0b3e6e0b632d3c1c5814ef8effaf34c7 SHA-256: 7979cc753460241be2dff29b6d7f9dd191c38b779f17c4fc74ad5620c4f281cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to PDFs hosted on compromised CMS upload directories. The document body is heavily obfuscated, but the presence of external URIs and compromised CMS links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://allytemp.ru/uplcv?utm_term=words+that+rhyme+with+u
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614899269a3e2---24197330367.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/tokoxun.pdf
    • http://thenext.pk/userfiles/files/juruderababotulilubuw.pdf
    • http://sl-light.ru/design/img/upload/file/25715327215.pdf
    • http://panel2conso.com/userfiles/file/koxezojudupokapasata.pdf
    • http://atomicattack.com/atomic/fckimages/file/9161979513.pdf
    • https://derya.afmiletisimajansi.info/resimler/files/zedokelutupevegugogin.pdf
    • http://gamax-motor.cz/data/dokumenty/pulekawixidukazavoziwi.pdf
    • https://cahayaapi1.com/contents/files/revufalexa.pdf
    • https://aviatroglo.fr/IMG/file/modipakoborigodajavu.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138a5ecbe797---jenotojedawukivalutixirun.pdf
    • http://kaus21.com/userData/board/file/56344249081.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c848d7a1---nuramak.pdf
    • https://sporyolu.com/resimler/files/fuxotanoxax.pdf
    • http://www.ctnphrae.com/ckfinder/userfiles/files/wowuwejefejoneb.pdf
    • https://ribaczpeter.hu/files/file/19835571922.pdf
    • http://asckhn.com/acskhn/userfiles/file/10678053454.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156537673b77---xixidepezi.pdf
    • http://westhollywood.ilovepokebar.com/uploads/files/kagexuganuvinixuti.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159124f33591---bupagagugutobafamelebo.pdf
    • https://jjpremiers.com/files/dopugutategig.pdf
    • http://alltechsro.cz/files/kudowi.pdf
    • http://poketomecam.com/uploads/files/69394217009.pdf
    • https://lemondedelaura.com/userfiles/file/didofepotukejoruselikep.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_off0000f54b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 16792 bytes
font_01_sfnt_off00010d5d.bin
bf71bbec2ae0ced457b330c60d9b501e8ad336d850175fa018e2b41272bc3031
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 20328 bytes
font_02_sfnt_off00014115.bin
7572c384a48956011b2df088e493fab65107b20eac34fe6678c1dfb13da247de
pdf-font-stream PDF embedded font (sfnt) at offset 0x14115 10656 bytes