Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7dad70843cce3a5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 21:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c3d86e2f06ac28cc61bba5988e264ac SHA-1: 6c39e7748a7b239849d2f808af27f5b1d3836697 SHA-256: c7dad70843cce3a51d076412bbe30b5a756b5b568f2f1c637d82b511dd0f5f1d
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drivetripper.com/userfiles2020/files/1450941584.pdf In PDF document text
    • http://php-lounge.de/userfiles/file/zupozuroza.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109121745186764.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/13217018632.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/xotovoxuberejefisuved.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/68736976830.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/wivovimevirumajix.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/rubekojipeda.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210910080229.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0d7jre7q51m82k96bc9a14693m/tututojiruxuwejexokogod.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/565a7692e4ca277e65051935b54576f3/47956471105.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec303edbc0---fubobifovimig.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/68077507840.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/23558845036.pdfIn PDF document text
    • https://sapporopools.com/contents/files/lukevafifabuxavobugonew.pdfIn PDF document text
    • http://jonme.net/ckupload/files/pujefovupobudi.pdfIn PDF document text
    • https://cardolf.ro/files/9340577602.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/mawimawojuriduxevamamuxo.pdfIn PDF document text
    • https://agrando.cz/files/file/japafafuje.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/23052626348.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70361e69e---1192159887.pdfIn PDF document text
    • http://osayit.com/images/file/58870248515.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d542f57---voxilagofogexuli.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/56070660239.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/43977215583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bubble+shooter+sePDF 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_off0000c5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C6 10140 bytes
SHA-256: eff3503eece648311bb2363a695a9b934df368b1c110bd6bab7fbcfa93505bb6
font_01_sfnt_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 17672 bytes
SHA-256: f4a57ab9f4847b954e92e6591cb5d3354634ca4b4e3637ca8126d6b7be84e546