Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85f4d3fc171bec4…

MALICIOUS

PDF

80.4 KB Created: 2021-07-24 20:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ba183ea795969cf269965f36240ae9e SHA-1: abcec786453b8b27c76f5a979999c51d9b7ec2b4 SHA-256: a85f4d3fc171bec403b1ffe435ca3a969a7a6a7dfca7b439f17754ffc64326a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of embedded URLs and the nature of the heuristics strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/cpcf0uv1rpv508sv1c7r2231t7/sifureruxumaweledilax.pdf In PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ba7cb1861a2160a1f64a1ccf0fbc4b97/31361128802.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/17387213889.pdfIn PDF document text
    • http://midel.me/userfiles/file/12657874277.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3721b64fc1---49496734386.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/75686646074.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/dgv97n5eopcdcp79bl68cqg261/dokawiku.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fddf813230---65965083286.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/jakone.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/dofezid.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/pexelituzutugimamafuzuzus.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/70303647937.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160718a8ba4b7a---kiruwufakeburufe.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94ea235ef---31289722554.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/kupin.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba9c97800---pozij.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/wujibisujaku.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ci40k0povc91jkeea6u4hsnds2/fowuwezoj.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/lovafadedoxexago.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/19295735084.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607713e1b2de0---4201385999.pdfIn PDF document text
    • http://digifast.cz/userfiles/28862836590.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/msa6tstrb6s4jf7gish04i1du5/fidepazaninavifewibi.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/jerufamimimovusuzobexuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=1999+kawasaki+bayou+300+owners+manualPDF 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_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 11120 bytes
SHA-256: 874bc8b6d037b91f346de7a1b4b7190e3cdd399551645ed88f66b90ca1932f13
font_01_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 16484 bytes
SHA-256: 581bf2d9b032e56821b927b65c499383636b15f949137e4ca9d2fe889ca8f43b
font_02_sfnt_off00011ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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