Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdbfb5d6943e367…

MALICIOUS

PDF

94.6 KB Created: 2021-07-16 18:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 055ff64bfb24d704366e544c3f924790 SHA-1: bad8cf5ee655561cb7353251b0e92f6587a2a901 SHA-256: 4fdbfb5d6943e3674f1015924fa629a9e1f89ac1bcbbf9188eb7c9dca31a543a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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://marketypik.pl/zdjecia/fck/file/47767355967.pdf In PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9626a174ed77c0fbea0b5046c35cf1b4/teloraxopewekovopari.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b3025eadc60a83d296dcee8543be3384/76772408763.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c9485940543c8d86f872ad0808957252/34249126648.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9a93fc34---50420210236.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b29d31243---kujatelapo.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/85284303583.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb969bd646---nujesuwut.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1345cfeba---12960823775.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/isetbmqmr1hqe0ka6623vsmqpo/romabugamimezitofarep.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8004acbc4ab6d2d9cb1c5c6dc32bf16c/93260247155.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/56add76f87f1a5c0e812fd27e0e570d7/zidolagenifikafaro.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f2a73b01---zezepivotopireva.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/91025196652.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3f205cf4---xazojevuwoxuvolup.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d0rqh7a6mkaieko3rfomrs8ir4/63149134776.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e321aac695c---33654440135.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/mejakejul.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ttr8670oofngnbu44pktvho1cd/53369413144.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f013d4a00fee7de2f455a8c800f8576a/negadugukawi.pdfIn PDF document text
    • http://lalinpress.es/ckfinder/userfiles/files/14849420011.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/sukofukaz.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160852daac70a6---54992809275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=interview+questions+and+answers+for+principalPDF 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://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_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 18000 bytes
SHA-256: f10d88fdd5837970a0d5ed284d02a5c5765f8ec745c8053f9f2564a1e8f6544a
font_01_sfnt_off00013d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001559d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559D 10964 bytes
SHA-256: a0e327f781ae0af5139cf5fda9b4fff0b01a1cb064ef21d560e02065e56876e1

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