Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd7a318c5b8ad1c…

MALICIOUS

PDF

79.7 KB Created: 2021-07-08 17:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 650746dc913bd8acdc71c0ab3d2b933e SHA-1: bdf6cdbcfcc038ce15ec4d13faeff757d36ebaeb SHA-256: 1cd7a318c5b8ad1c8fbe5311b4745351b1b1ba407119923e2de3b2c7f1f1c8e8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers, containing numerous links to external websites. These links are hosted on compromised CMS platforms and disposable domains, suggesting a phishing or malware distribution campaign. The PDF's structure and embedded links indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=sign+pdf+with+cac PDF link annotation
    • https://ijmscr.com/ckfinder/userfiles/files/wojeruwarazorujopew.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072b6a8eaf02---dipivomogifoni.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/68469548441.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/862def0a22e47d4e313eccba56656b03/rixagafenero.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/kexiloxad.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/14096206109.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a2b067cc---9957105222.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/84215158127.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/852f51ba4c982c44b6f48d3b697741b8/lijinubadegudag.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/judujitenudorodito.pdfIn PDF document text
    • http://askort.pl/Upload/file/luduvoliwedanevo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/98027087247.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b80ce63b3eb9792d3c35918db3ec7feb/sezodazizetutakixavowuwer.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085b00d5696a---70670539839.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/fc1c38cmrgaacmn6m4naeihpi2/72171485736.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/r858miq11og7am2r5q3e8190a4/wubukebikawojobum.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d5460ef42ef68ad49723ad9595e5f19d/60807995602.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/63414925338.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609831763ffdf---kamaxisexumukelosolo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d8d5798a70cb78217063ea08f65f3c2c/88673730064.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2c19083c---52600976036.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bbb9c1b58c8daba173fc25cdf6fe1265/zupojiluserisove.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f268f3c010---12328822688.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a020638a03f---51650805918.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/dedfcf5f88da0dbf40a4b24563848ac5/74904471160.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/28909168789.pdfIn 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_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 17028 bytes
SHA-256: 236bcdeb346f0cb08f2d644eaf6566fab22249ef9c65a105bd8fc608857bdd62
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 10496 bytes
SHA-256: 65e4c29e96d7755657ed3e77db238366e102431d536064678251dbf9e31ac24d

Open this report in the interactive analyzer, or submit your own file for analysis.