Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e14a6a71ae1129…

MALICIOUS

PDF

86.1 KB Created: 2021-07-22 08:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 22a55266f2a6b4b2cdc01cae4a227a41 SHA-1: 098c6c3f971f67804c5119ca566ea553468d27c2 SHA-256: 65e14a6a71ae1129dac3dddd234dff36a9bf94d8157f7323ee5ebd250828c19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/0n8ldku15m6m14ljhb8fo666ur/93460169841.pdf In PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ql057tbmkuf3tpe8tjujb3qfsq/18406061484.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/sufopuluxulafubedud.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/tatovotizojogezikobopa.pdfIn PDF document text
    • https://bczenekar.hu/files/file/71973173544.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/pukereraxenupinipizufimav.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd3bbac18---xomijarojurosibuki.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/9jo61ej7fg0jd4nd0fb4jpt6n0/zuwekowogawoxud.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/vigowesiwozalis.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/aa0a35c05a57c85193cd8d0cd446c2ab/jedekuxijigebikekezidugiz.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759c9a2b2b0---rimiwaporudaribazojonujuw.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/29040946970.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/mezesinedarupuru.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4f5efff4---xiligo.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/3313706976.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/bagoverijetezazekukezi.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/kibakolevo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760e8b53a8e---xatalomawukuninurul.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02b46ad380---33840904951.pdfIn PDF document text
    • https://edusfera.pl/upload/file/lukelawebiped.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/nopogiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=non+freudian+theory+of+personalityPDF 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
stream_006_off000131be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x131BE 10788 bytes
SHA-256: c2e209eda564dfb208f6c11cc65e422e7d1bed79e131b51c94a0dd3189fa6744
font_00_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 16548 bytes
SHA-256: 480513d5c1b4a23d70bfd7166b01e608e4585639adb3b17223cf9a8b686b9300
font_01_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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