Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dad50940550668…

MALICIOUS

PDF

91.0 KB Created: 2021-07-24 17:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dd00c1d13a319ebc29d360a9a1f83be9 SHA-1: 67ad1993ae340d5d9c8218c7c449f8e1b01be896 SHA-256: 50dad509405506681a55f87d29d8786c63c28892d95049e8991ee42fb7d1a05b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories on disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely used as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086583252400---razavanobogazizezedamez.pdf In PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/02375g44tsmjcqhon8ns3keoh8/96700157262.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/82256579349.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/v658ikg4pr6gogdqkr1bn7ji7d/rakozadutozuxatitos.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/mugokesufe.pdfIn PDF document text
    • http://hasyo.net/files/file/jefatukutaxasopuw.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/73518452995.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb446ddde---58251702986.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/33597105544.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/dd83aebd963e3c205cb12f62dfb2bd25/deponozujireruluwov.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/zirevuvomelajefifufe.pdfIn PDF document text
    • https://steammining.com/userfiles/file/88473500396.pdfIn PDF document text
    • https://led7.ru/file/1321866146.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/radelazibapilinidosabezi.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/raguxodidexage.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xamivegegigubarenuregaze.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/kinifalexilodi.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/21494809368.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/pobomeduvamozesakureru.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8bdd28324---bixuroxerenegekidiruresim.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fc76ad90e2738fa502eb15b2c1f6f6e1/rebawovegabewam.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/58663009773.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/71541931816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ingredientes+para+pizza+italiana+originalPDF 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_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 10580 bytes
SHA-256: c55a18de6504d35e943acb8c6e5e988ec31f2dc5bb19551eb0e24da087b2408a
font_02_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 18360 bytes
SHA-256: ef146ff459592c10d9693896b2a28b56ed10443efc9a7cde0a106662fcf92676