Malicious PDF — malware analysis report

Static analysis result for SHA-256 906e5d5489e34724…

MALICIOUS

PDF

84.7 KB Created: 2021-07-04 18:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8bdf2e82e29c81c42a1a8d57f5e0ec6 SHA-1: 4c8cd383f8f1b840af5eb85b4b240558a64aaec1 SHA-256: 906e5d5489e34724f457bc0918e9105ed531c8ca47c41711f0b3172def8a0140
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised WordPress sites. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, suggesting its primary purpose is to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf95fb9989---15036425361.pdf In PDF document text
    • http://cioccolatogallucci.it/userfiles/file/34239409449.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/bewefupolekel.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/babexatipefedigiruduj.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075137349423---koruseje.pdfIn PDF document text
    • http://envigest.cz/upload/file/14781145485.pdfIn PDF document text
    • https://preciseenergygroup.com/media/81262906983.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/10f73cbcd91d7d80f9d18e428d7adb25/renadapifajago.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd71f03290---44589662467.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/71859063693.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/86600869540.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092099bafcd4---56004655538.pdfIn PDF document text
    • https://tangente-mag.com/img/file/1930550754.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da9d6a2097---99179265113.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f2031e27---45190304041.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/egvde0c7ipg8pu8tgnfeegr34r/bemeg.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/71572044219.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cdc5ba1b5---todufel.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6e8041b16d6a0e801087123b6020aa46/zibiletun.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/7310135202.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/oq2lmgbl8s1mrr46oe9vlluvi8/noloraputet.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/botamazepexuf.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/abm30apbjqlh15ltssq17vtdf4/53267402892.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aab3f144f---rovudarutazuna.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/41762eb5c7519acee2e5a03120aacf77/kinojaludawavalute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=treatment+for+irregular+wide+complex+tachycardiaPDF link annotation
    • https://doi.org/10.1002/9781119389613.ch41In PDF document text
    • 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_off0000e71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 11264 bytes
SHA-256: 278fd097f3c3e9f2872e788ebf77410c29df19fdfd8c029e5d0ee2ff2f85ebc4
font_02_sfnt_off0001194f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194F 16952 bytes
SHA-256: 7c74167647d3c45d8103767ef53243e0dd5e09e78fd4c73c20440e00999b3fad

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