Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eaf68148f483bc3…

MALICIOUS

PDF

75.7 KB Created: 2021-09-26 23:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4eac7a49513b1106da643690aa546577 SHA-1: 3287928f93256ed6e4acbf4f8cd9204b149f3467 SHA-256: 4eaf68148f483bc3b0baf40c8c20d2567f3350b9d2f3df348ce8e2e9e6c85ca9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and heuristic firings for 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a malicious intent to redirect users to potentially harmful content. The presence of multiple external URIs suggests this document is designed to lure users into clicking links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4583

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://pixomot.ru/uplcv?utm_term=showcaller+pro+apk PDF link annotation
    • http://firesecurity.sk/userfiles/file/50499791923.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/85488670697.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/bomuwobore.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161505f6a1a332---91369187785.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b3583691877dfc99e68b3eae5c2d988c/1605046858.pdfIn PDF document text
    • http://trovas.com/userimages/zedavunagomoxunim.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/gigoxalula.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/78758692034.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/jepubiponewodomibinunosi.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/sunefizamevokidiloze.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/30189272048.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/7780831869.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb6539dc4c---80929511313.pdfIn PDF document text
    • https://csodamalom.hu/files/files/pizefevakexetituwukabu.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/45250125182.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/vomigote.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/fesirufilorosoxenuko.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/210940398505.pdfIn PDF document text
    • https://koratspring.com/upload/file/22239988492.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/252393318.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/25438946841.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/90365202325.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/17227927937.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/20815207821.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f231911e---33693743561.pdfIn PDF document text
    • http://halanmilk.com/upload/files/zikarekotiritij.pdfIn 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_off0000c61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61D 10260 bytes
SHA-256: 4ce4d4ef6261cdfefe61e71cc27a25df9e1ce06d634ab0d73d824570d38ce416
font_01_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 20512 bytes
SHA-256: bb14315756659badfa32e9eef3363f1dd50570338f417f8bd14e063e98a3b12b
font_02_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1