Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc683e069a971a92…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 14:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f93a721d8ef018c3a2ff3c90cfb866ab SHA-1: 83dd29843b4dd6871a4828a3cdd4b328b21206f9 SHA-256: cc683e069a971a92cf64d67fcd7cdad74ce6dd2224b11e605541d07545884e74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for distributing phishing content or malware. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. The file's structure and embedded links strongly suggest it's designed to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cassotech.nl/site/data/ws/files/50532537819.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16139051199d6f---21542291479.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/tanelavojolawewezagaj.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4014f1bf5b2d242000825c571ae4d256/72535066399.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/78346930727.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/sepoja.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e389ea315---wokulukokiwibiwirunozepe.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161334f5b8fdf1---85264085498.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/wexixituvizigosakupuj.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/83805768178.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/41338724160.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109092348245738.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/570f403c2f245f1d5615185f0c304f12/gazulewodino.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/kabolilevomamepu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161341096e5b89---21897702979.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904015617781164.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/wuves.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/dekijovusegewozejafapageg.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/58113156003.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca3286b56---zamalagafasukib.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140bae3164e8---51027460337.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/31066161831.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec83789f5---viwunotul.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/loroxixudurorasusapomotev.pdfIn PDF document text
    • https://webhosting4.net/media/file/lobagepuzugamugupevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=unlimited+energy+criminal+case+androidPDF 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_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 10832 bytes
SHA-256: 29b43dbc216a3ebae33d85c8da3a4b724c7aa6a21197266c31a0626d8aa2a748
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 16972 bytes
SHA-256: 74173d6b077f478268d0705b142e81a19d7666c01986d6db80bf561b55364cd9
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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