Malicious PDF — malware analysis report

Static analysis result for SHA-256 867c1b4069eb5fcb…

MALICIOUS

PDF

76.4 KB Created: 2021-07-23 08:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c868a8139d0cad55d10f6edbd5d8a630 SHA-1: d3462f22c9babb5fefe9f0ec84edd77bbf87ab68 SHA-256: 867c1b4069eb5fcbe7de0152d9910832d6aa3020e6551b94b8a59c6a0b29846a
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, embedding many URLs that point to potentially compromised websites and raw IP addresses. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gintaras.cz/userfiles/file/78508030587.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0ed55db6---gilutere.pdf
    • http://compufoxmail.com/userfiles/file/8943132539.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16091583d04527---kuvexepivajo.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc3eb026f0---56848160194.pdf
    • https://bandotrading.com/uploads/file/zopavowixupuk.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d445165b---vavozoriwuradakokevarubes.pdf
    • http://www.kickcommerce.com/userfiles/file/refivusemuzevalafadovipil.pdf
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/54900778708.pdf
    • http://parkhigh65.com/clients/4970/File/dipavix.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16070efb22d77f---daninisararusaxat.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609405a63de1d---vivamevorerilumufod.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i5qq4o73bg124ja4cng15jkuo5/11140895739.pdf
    • http://artecgroupservices.com/imagenes/file/pivanemowirerapejilalar.pdf
    • https://liniagdanskzydowo.pl/files/gifopejevuboxaxogin.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b95a30cb57---49484902853.pdf
    • https://espiber.cl/images/uploadedimages/file/87844208030.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/januze.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/87c96468512a2b6c682564839d6c3af6/dabonaj.pdf
    • http://galluccifaibano.com/userfiles/file/nabezomamogusenikiwovavum.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/888ff1b1948ded7e4bbd0020da445001/liguzosixoru.pdf
    • https://nguyenhungstone.com/uploads/image/files/zijeritogosexiku.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e301bb3bee---11430627282.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0c6c29602---tixiluvopuxuzefi.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1b4489b3e72a2ee7f3c293e5280214eb/susupoze.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a774de100c8f66e3b86d83d6c06f86c9/11100920943.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=biot+savart+law+and+ampere%27s+circuital+law
    • 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_off0000c6f1.bin
b51bb3ab942bf3208319c5bcf39d71f1bab79ce57ac56769a85909c7aeafc72a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F1 11016 bytes
font_01_sfnt_off0000e0a9.bin
e6b131f0b486fbb9bcb33bbe3c10b08ca4c8a110d9f4bca7f761f68fc1006f66
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 16452 bytes
font_02_sfnt_off00010b04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 16792 bytes