Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4eeb185a53d8cda…

MALICIOUS

PDF

89.5 KB Created: 2021-08-06 09:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9127e1929e5013dc412611de5055b7a9 SHA-1: d012f2ada68d68338dfe9ec47fc8e2efbcb2ea81 SHA-256: a4eeb185a53d8cda9949a5ab9ae256b016d33990b2c044d2db5c4f2877bd10db
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document is identified as malicious by ML classifiers and ClamAV, and it contains heuristics indicating a lure for remote support tools. The embedded URLs, such as 'https://laborke.ru/uplcv?utm_term=teamviewer+7+with+crack+free+download', suggest the document is designed to trick users into downloading and installing potentially malicious software disguised as legitimate remote access tools. No scripts were extracted, but the overall pattern points to social engineering for unauthorized system access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://laborke.ru/uplcv?utm_term=teamviewer+7+with+crack+free+download PDF link annotation
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/32b2dc02de6752fefa06ad8c52c712a0/fimomizoluluninav.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8lmjvhdp5hboar28re47i2lps5/rozepupexaroxixatapi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0b209a4f---21835257688.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/81416849373.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e7f84862ede---gewojemebi.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/jivabakuvofedu.pdfIn PDF document text
    • http://4bx.pl/public/file/71857368428.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/diberadepejufa.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/fozumilesulirovabid.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/94036906424.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bfe94f654---bafazepe.pdfIn PDF document text
    • http://dgjst.com/upfile/file/rowir.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073b70550639---87250795619.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/gofobubikiginozigegejab.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c937e113e---sagelitavasejuguxunu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd81588eb4d---82395674982.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/14769386468.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/vovetirevuli.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/noneza.pdfIn PDF document text
    • https://dacola.com/upload/files/mivulozorax.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/ladijezekufuwovinufezowu.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/84877257415.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_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 10832 bytes
SHA-256: e4834a23c4577d0818b15826fbcf9503819fd2fc6e91dba101b0795ce30736d5
font_02_sfnt_off000125ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FF 18668 bytes
SHA-256: 7a4e3950a78a50105253d93eed15cfb79be872b5dbdcf800353405b6e846de92

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