Malicious PDF — malware analysis report

Static analysis result for SHA-256 17768d480c4644f5…

MALICIOUS

PDF

90.4 KB Created: 2021-07-07 01:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55f7db698c4e39cf94f6c6a6bd31e3c0 SHA-1: cf8a419179a304f5a54347dcc17588c9cdd11329 SHA-256: 17768d480c4644f57597cf0f5f84120c2e0d26f4d4d008c1000cffa4fa418668
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://termoformat.md/img/files/57978408973.pdf In PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e7b15f71fef31cf9c41ddcc393d671d3/66907013508.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/kipapalujawexobosiruz.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16071541b1858e---34110867158.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/8195103102.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/26521305773.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18cdc1c9e---5066517885.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a596364e44d---duvesi.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a4f34516523feca9ae8f2ae54678ac9e/nukudi.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/57224293320.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1541db81a14fc139cc7b300de796fc06/pukakelajananamexekegusu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecec42b57d---gosufogamokawigadodot.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/womoxetevi.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0a16f8e2---8501511176.pdfIn PDF document text
    • https://airbays.com/userfiles/file/kuxupumosejek.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8621fc009b3084266d5266d44da17ff5/16401533755.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/vevazimalurosagibekek.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/25478397499.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ebf0c818---96140697739.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/midimamur.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6cd0613498ce03e9bbedd0e055a35a33/3231798729.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aeebd8457---45992871465.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5784e25334---33047325526.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9ee7d1bdc22ab3f0ac3c091fe3b8ef46/23161609829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=most+suggested+moviesPDF 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_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 10336 bytes
SHA-256: b139416558dd80304ee38257d8a2d97770763e0ba396e497171fc83d4845e249
font_01_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 17816 bytes
SHA-256: 145b039ad13734bded0c094d40c4e6c6727b9d13c94a5aaf37702b027608ede9
font_02_sfnt_off00014462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1