Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ac3bf8100fc881…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 15:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c8f9cb22d4b138a16ad884040cd532df SHA-1: 394abbc8fb97f75ca056869eb34e6881cf248dee SHA-256: d7ac3bf8100fc8811aa9c61939fb065a48273c1782a6e54f3ba78f1ec75b79bc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The presence of numerous links, including those on compromised CMS uploads, suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

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 https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2f15d983611c69b122467b16665979df/pudibimasifazet.pdf In PDF document text
    • http://wannawwannie.pl/userfiles/file/68686668293.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/vowesogojabajemuf.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6011cf750c0bdbfb91defdeed354e55/tukaxedow.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/xunefomasadomadevod.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/69873412292.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160913434ea844---sapujipiwis.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/7729430108.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c793c612---kivosar.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/cakq567c9isk85p5pg8bke963p/lavisewugakavide.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c887a270---bixufobozomejoguxofu.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/likumisupegebufapobew.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/zexawarilabowigitor.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607955eb5d62e---zezokavoxur.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/bijatedetejofewevefop.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2d8e73eb35c554b2ca9aca47c290373e/gatutubevokutagu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846a1009c27---36022987738.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210511203106165.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/vubebinemobusoxerirido.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba77a4cdabe---26023085414.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0a82be7cd5af5dc53603fe003613a5d9/jizodanekajujusifikexole.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160878d2a285be---1682778572.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/94858532492.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/notativoxevisif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=elt+approaches+methods+and+techniquesPDF 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_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 11008 bytes
SHA-256: c2bf3f957a897619c2ae7264e6f2d68abbb9adc419f2cf22ac10b12b954ba061
font_01_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 16824 bytes
SHA-256: af2e9c55237373daa07c9c3d91b4dc9e12c4ca1cefc52677aec43493cd6b5fe3
font_02_sfnt_off00013324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1