Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19c514c7e56ea64…

MALICIOUS

PDF

87.4 KB Created: 2021-09-12 17:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b26fd31a0307f16392152c702c454a08 SHA-1: 10b37d872cadfe6de47377ab78344a2725fa91fe SHA-256: a19c514c7e56ea645773c5ffb2b32d77d7c01cb92c06a629b39e251ca4b70599
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. This suggests the document is designed to redirect users to potentially harmful content, such as phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://seikai.jp/free_images/files/birixobaxobajojibilefole.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e3420a60f8aa40f871eae5266812f670/22494279093.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/4581194781.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/vivizur.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/91075848446.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091100174146.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06f0b3f9c---wifofewoxugipo.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/vovitemudinomujak.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/06be99f3bb7dfc041e9cac3293fc1673/tovavanegu.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hcmkh9db2e4s7tbhj1voai91db/puxetekoweruzada.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/kapewasidegedikatif.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/zafujova.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902024941816474.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/21527079410.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/52836808117.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/57955569023.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3b9fd3db38a3b373693250ee3cfb8b34/motofevoweketixemezum.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/toxaduzizupodamoj.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/juxosuluxezogi.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/31323982048.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090822574218997.pdfIn PDF document text
    • https://bak.vn/upload/files/13992380923.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/wewuzawitepijijonafufim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=clash+gems+brawl+starsPDF 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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 10496 bytes
SHA-256: 122af22c3aaccde1b3aaa3f4cf7532ebd3909e308f9d7cba590aa7872c93a6bf
font_01_sfnt_off00010769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 18536 bytes
SHA-256: c3fa6e9797bdd80db283cbee0ee62f5b09b04eed96b0db5c73c43d9817b5b1ea
font_02_sfnt_off0001380e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1