Malicious PDF — malware analysis report

Static analysis result for SHA-256 163071c1f6023e57…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 21:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7898e129a9331b24d837e8a3f174fa90 SHA-1: b8950cf619c74d5bc28a0d296fd104acc9cc80c3 SHA-256: 163071c1f6023e57cfa4abdc06b98558c75f668f9b2de10503fb0cf86affa48c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a malicious link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=faraday%27s+first+law+in+electrochemistry
    • http://prmakeup.com/Image/files/wikawotavazesuro.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/967859149aad8432cab88754812eb266/12751991295.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/raretoregimupunurelige.pdf
    • https://schmitz.cz/res/file/19199489383.pdf
    • https://okinawa4d.com/contents//files/sipijuzulewu.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/741b51c75746642cd5f007df0fd54e07/bidopanerigeb.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d4e1ae204---meluretatop.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/73f84d1e3073bfab6778968ae72233a2/13523471713.pdf
    • https://ajitcoatings.com/uploads/jibofowigowaji.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/bevakevunapupadala.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608483b1d5b94---51896755248.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095ccda870ec---vavetav.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d36dd8b726e---90936242151.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/35794f3d90e07bafd2d3aea9c78e4dc6/41058789822.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2roua55bpsnh4er3ck8rs8ns1h/59180624653.pdf
    • http://jar-ted.pl/file/93519347320.pdf
    • http://technology-mp.it/userfiles/files/92058291205.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f128d8b1b---35515294611.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/5d597c073f4498ffe41e90f96afa3be7/551351014.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qqvnbg2fidp0p35c4hcdotici1/24198366003.pdf
    • http://amtutoring.com/clients/865321/File/96061267146.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160805498718af---8122281894.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/vobamidarezatol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 16792 bytes
font_01_sfnt_off00010283.bin
0fc29f8f8136cda98afeaef15461ed8f282e4341067fdcbe63b8815aa25ca343
pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 18044 bytes
font_02_sfnt_off00013199.bin
52635e91650874fbfc6404f6ad7ba62458a659a88e0aa9f87899308bd38e5255
pdf-font-stream PDF embedded font (sfnt) at offset 0x13199 10952 bytes