Malicious PDF — malware analysis report

Static analysis result for SHA-256 7155f4170ade9522…

MALICIOUS

PDF

88.1 KB Created: 2021-07-07 14:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 373789a545266309bb3d93dbf1af7eb2 SHA-1: ceee9dbb053e4bf1824c6a95117615b9c78cd7b5 SHA-256: 7155f4170ade95220caf81dd0d0df6de2740d1da9503d1d788d273eb5cbdcf70
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the link farm nature is evident from heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ec43d4d2---57053854486.pdf In PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b278eac99b9---kegunuziralu.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/dutatisefuxenusizot.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/wumewepomesotogimigoj.pdfIn PDF document text
    • http://pavimenti.pl/web/uploads/files/xaluvexiwedutawa.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/52puokddr61rh4a3ivg3ov6qm3/40116499938.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/67244341213.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/tisumix.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/vigufasinosagarubep.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/nifiko.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/310f0ab050fe510ad6fd8c6bc6737b48/farizoderi.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/xakade.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/67307190400.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609691766bdec---49911367883.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/82263299103.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aec693a3a9a---13294980452.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/16c90e988b975459bef64b55da350c7c/5233912281.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/doxatorasepike.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qatvdatt21iov1c2rmlvanoc23/14792695352.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073941eacea1---semegiferutal.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dca81125a---45668444231.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a35b9324---60420882378.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59b7af1df4---37942807154.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5a0abe45---71274472893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bible+verses+about+god+accepting+everyonePDF 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_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 17680 bytes
SHA-256: f2038198d147c062e690697b1ac249725b4fbfcce36cc267757bfcbad28cf58b
font_01_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 11164 bytes
SHA-256: a29cead44de3b78ddb7afc662726a53fef5fbe1d630095e4808b1a17414546d2
font_02_sfnt_off00013aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1