Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23d35ed65bef9d4…

MALICIOUS

PDF

87.8 KB Created: 2021-07-16 09:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 698b580bb66a88977a21741a01138984 SHA-1: 1532cbb7b3b80b819708f271a8d0eed537a0f940 SHA-256: c23d35ed65bef9d465d8a0b6ddf338d5e4f0610333dbafd1401a4efc59681382
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting an attempt to lure users to malicious content. The presence of link farms on disposable hosting and compromised CMS upload storage further supports a malicious intent, likely to distribute further malware or conduct phishing attacks.

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://kantoromega.pl/userfiles/file/mabafubilodato.pdf In PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210630_E6FE77EAA91952B9.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/41804728113.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/32782f1037359e471d4503b61d417874/36042898782.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d9f2bf560---jejomeditimivax.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902ae4efc91---89838418662.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/19cf281a0c1b2afeb7563dec06d09c0f/darosapubevulavoxalo.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/3606498045.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/83702870741.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd957da8e1---35105087861.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f69d660ca00a239d4a4cb53e71df5658/bulonanubawibegukazupa.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb09e04119---rosiwajosuroziditifidik.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0bda6a9ea---53792618723.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/xibununifatabuxekes.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6ec1c00ebe82c900def4f4b9a832678a/menuwojari.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/neguwumiwiragoxoxeroni.pdfIn PDF document text
    • http://ge-mak.com/files/jafajofinoripedesabinidix.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/kosamudezafidox.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/zirelimalateja.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a3a2bdc1---bigekezol.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d059611fea4fba88043014dde84216a0/xokopujefizovada.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/741c42b345d3124004857566f5d83413/rifove.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-14/images/files/latidozofudiperavuna.pdfIn PDF document text
    • http://fedoro.ru/upload/file/80868259787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=who+are+the+founders+of+sociologyPDF 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_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 17348 bytes
SHA-256: 54046e6ed907dd632df05d261951fe83dca558e58d820255aaf6302a70778df3
font_02_sfnt_off00013898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13898 10960 bytes
SHA-256: d3b59aaae53bfc4433d7d39a97d02b4ffcb4b5832e07e7542c6a569cd9c182c7

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