Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce9fc7fa52132f8…

MALICIOUS

PDF

73.7 KB Created: 2021-06-20 00:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a62f6aad5070d18aba532d047c83c4fe SHA-1: 9677e6dec8877e022fd7dba36f83c3ce11cb323f SHA-256: 8ce9fc7fa52132f87baf9f38d8d25fa1a5103e43e687b8e1cb82247d77e19f01
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body's garbled text and metadata suggest it's not intended for human readability but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vietnaminsight.biz/ckfinder/userfiles/files/dagorumolido.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/180003547.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/56e5e31ea863b918834e463f94648f07/91739882243.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608347403c421---nixaxibolanewopivi.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607284c2b9329---tirekatozi.pdf
    • http://chi-kara.net/userfiles/file/pijojusugukanonojo.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/jshdo6oeigkoftmniq12pkb9f1/vakipujiv.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/kg92e8blsqgb6spqhn423lguae/mofikanisodawulutisagin.pdf
    • http://bidwoodmachine.com/d/files/musujuronamodurirup.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6dbf23e3adde16fcdc84b1e9209f620c/2472984298.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/68cq7pl5cf2c2cc93a7eputnpl/sikutugolumimomepes.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/q0s788ec2boljp03a1nm259eju/68678217706.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13f3b255fa---dapeba.pdf
    • https://rybczewice.pl/userfiles/file/51297112993.pdf
    • https://nezrenpin.com/calisma2/files/uploads/dugonefuzakirixedakawak.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733c70b8da6---84729955429.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f4503e88c98e427a3ebb7ce1f2feccc1/gibunapubanajomumizu.pdf
    • http://musorcentrum.hu/files/article/file/zakuzuwedofixi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=super+smash+how+to+use+ultimate
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c7.bin
92e452a746c4442f6a62e22d199ba713e544072dc9b2b2ca4ac63cacd1e6823d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 5256 bytes
font_01_sfnt_off0000f589.bin
a1d3aafd9fd7fadfd57bf5bf6b7ccf0172c2f37c751a308cfdb26e6b666b280f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 10676 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.