Malicious PDF — malware analysis report

Static analysis result for SHA-256 534d31cf51c6bffd…

MALICIOUS

PDF

109.9 KB Created: 2021-07-24 08:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57748254be715cec9977a806536c1afe SHA-1: 723eb0ecf6c9afbf101694e574aeaa6cfabef588 SHA-256: 534d31cf51c6bffdf277df749528b95d56bf06f24833c081921d628edca8ce98
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b851ddba713---satisevogaretukefovupo.pdf In PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/78574590116.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/caa37439facffd66b09f24d85e70277e/61293566282.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/56264221239.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c016d72cc---pokafuzuxe.pdfIn PDF document text
    • http://edeins.com/userfiles/file/16675325297.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qsrni46dhq3ipik6stq5fu7i7i/wutasatoko.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f00fa387827---9232666087.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210616020204147.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/nd2b7bb48iuhh0srue0g28l9t3/vekozisu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/p9n3aphg28l8phdg740afindrq/neluv.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f39bf5d87ca1d550156de5b872846888/nifigeb.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/42817606940.pdfIn PDF document text
    • https://dm288.com/slicice/file/35479952965.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4c1437fd459b8ee4f0bcd0ca838d2168/73260359158.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6676c94ddb---21779462753.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078c37716586---zuvodudogubozetarupejuna.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9a872a4af7501d8011425461a65bfa0a/77813570865.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784d98d8498---tokadizow.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ol7lcqoc2p8m7fjthuih8en8ao/figaloxaworob.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943060891f7---46261197990.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160736f0450c2d---40791474110.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/pulopozawojubapa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867460d0d26---5908993852.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc14279439---10396284078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=objective+genetics+by+bd+singh+pdfPDF 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_off00014a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A15 17324 bytes
SHA-256: d5a1b2f2c756a20d4c8e81399bbcc6f9336995a3ffd4bc936f7b6a8b62d280d8
font_01_sfnt_off000177b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FCD 10948 bytes
SHA-256: 7cdb9e8920acc715e55d683c78046b7ef325c5a078ee102e02aed3fd56b952b3

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