Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad316e798304f37b…

MALICIOUS

PDF

89.7 KB Created: 2021-07-27 14:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a24d60c0452385ae0f8ba6dabf79dcf4 SHA-1: c7697e9ab29d560beb0006440a57211173c5b01b SHA-256: ad316e798304f37bb832658a9bc21ef0d47be50378791939f67d2771f6cb80ca
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://dunajecbiala.pl/upload/File/22894337121.pdf In PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d121150927---32466319084.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/1afcdeeac35cc4bce80e511d4c0bb5f3/42357108174.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d82e46bcce---fojetubezimobu.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/73394486975.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf11dc7987---43190090103.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/11806675428.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/51654853401.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/366b1412c201c5c8312e7d7a6808b511/54939743978.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/62qiolseu60fm7jqcunn2q213c/44630598579.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217d25bf04---58950924119.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/nufiruzokukisolupizalo.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/82739217588.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/kiperewukapuso.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077819779cde---tapumexupewoniserino.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/47056106582.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/0p1is344qfqbt83173e9thkv8v/jokifinexa.pdfIn PDF document text
    • http://e-sportis.com/images/upload/83543791589.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mopidagipadato.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/18110056010.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9305bef36e---nopibuberexowaro.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/758374cec1d4c045596a949de4e04ba0/dixudajerejem.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/damabelaxojarama.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/8058578505.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/80479110096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=self+advertising+discord+serversPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 10792 bytes
SHA-256: b3ee4a39fd269d28ce5cbc0936c8d9d08ae532a5d94560cb7f029ae2cfddd32c
font_02_sfnt_off00011ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 17820 bytes
SHA-256: 655465bac45a2de751229231d668f8e56af6bc98e79b5126f516d9a0ac5f9b6e
font_03_sfnt_off00014e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E06 2332 bytes
SHA-256: 0a2328277e3fa882c44dcc7205950c371bec19138dff78084fc244ee5f721231

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