Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0b4d38eb386317…

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 12:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc0b453ee7729437f53cf6761d012b09 SHA-1: 5dd7278bce9ee109d85ea5588bad845a85b01b88 SHA-256: 6c0b4d38eb386317f5a16b03552b80207e3c3e9fac14dfe10318535061fc0dfd
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://speculatio.in/ci/userfiles/files/tinofewezimixavopuzu.pdf In PDF document text
    • https://godahoian.com/app/webroot/upload/files/jedarobosuberiwevix.pdfIn PDF document text
    • https://dom-titan.rs/files/fevofelazamitafomubege.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/26412193653.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/igsvaahvdcoa4ii4925uj93pn7/sefiratutide.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/57694364369.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/74285260081.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090922125129.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/nuduwixavevujegulazikebab.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/33716592212.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/32479254909.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/lufavedofetogisazog.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/ridav.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/36025498942.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/mifumupovosaxedujibo.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/99292965636.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131436ae58d7---71660317808.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/puxizamafozaku.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16139e93b723e5---74561933536.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/52829923510.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/57003993067.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/nefevokopevogupezudul.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379702a9ec6---18746382188.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/64730284452.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210902_025233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wuthering+heights+pdf+bookPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 19048 bytes
SHA-256: 250b4b269ea4919bab6b743c86ea45fdfbef9e2faf9a1f8b9c89215f861be15f
font_02_sfnt_off00012e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E82 10896 bytes
SHA-256: 5be07c37b8497d4a2f91bd0ecfaf5b074fc88579b0f44f71e266def2ea68e708