Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f71a612306fb95…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 03:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48cb9a19b4926f9ba90f8dafa35f87b9 SHA-1: 08d0f83826983a293d026d423ffd04e917999fbd SHA-256: 43f71a612306fb95d7ea392c809e07f3c96bdd2b7bdddac03b8b7f2d05d29f1e
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised websites, likely designed to redirect users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://analogsys.com/uploaded/file/1322556039608c0f151118c.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/71rvkp2338bbspi5egrpv6s4cb/52387867490.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/d5b04a7c467eaf7257cfdef2f28f6ec3/81448049709.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac26c6edee3---jedusesosedudisu.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/kuxuzixumese.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/oto7s7e29iinoa4r0fadd2to5u/17958973474.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/55c9ee2dc375376cd820ffe82ba160b3/73725582377.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/10427156574.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c742d238eaa---81199868414.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/pidamapunodemilad.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/q0bpsqlm8us9hg5gts08p85t6m/70421395861.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/61999637641.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883cd80c72b---28596195009.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/64613713882.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/m0is8mq0tollu3a87u6vef49m2/nowege.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eda8b0d7e---zepokadirujenojolomeruna.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a391b6a1201ba43533327068630e0923/84148654410.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e00224e1---javifumijenu.pdfIn PDF document text
    • http://yuha.be/_files/file/kiboxejekegaparikoregev.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4dcbf82e---54071892202.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/61905fcd5c5520a1f80738ae2ab77b63/14846613593.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c5c1ba33---faginided.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/77707460449.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/kigisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ditch+irrigation+questions+and+answersPDF 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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 10936 bytes
SHA-256: 1dcb056a02d255c36a4588781998bfc39325067adcbc2e383ddd37ecab1e9187
font_01_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 17620 bytes
SHA-256: 04a524aaa2ecb217c4c6c9192002b71173876e8cc761db9bd42f0f919e064e52
font_02_sfnt_off00013447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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