Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f31f7b2048baf9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 16:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7db93a27fc2b75d72e6bf9fd3792db64 SHA-1: dd6c9a874829e9f52bec01ea0fbb251812c0b8ec SHA-256: 81f31f7b2048baf958b30473985e6f67b41ad9f3e86c782927b86ac9ef7e50a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+do+i+move+all+my+apps+to+my+sd+card PDF link annotation
    • https://gogift-it.com/userfiles/files/pukipoxokerebuwis.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613006cfa9679---takifegu.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/45179085479.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142eba418df7---12954581354.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/50643482866.pdfIn PDF document text
    • https://kildevangen.dk/files/gositafe.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/benam.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/jixemuro.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63851a3ad---bifezoxopidolixunabekena.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/bovudodas.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/tipilebaramonunaretibarop.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/xepisajezurene.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/20213480533.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/bivojolazaborilorasatover.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/fenebinune.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/73881569799.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/nabikadeduvak.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/fojigib.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/gigobovuje.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210915210429.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/94712511387.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/23273647936.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/29113604275.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_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 17908 bytes
SHA-256: 5e473c445be76d9c9056e0aef41dd25624a2f9802bd154fe4aaf1ca6c900d4d5
font_01_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 10828 bytes
SHA-256: 6940f40a9c886bd07923fadd1aea78cc72dec15ec9ab466cfc7a999da981b342
font_02_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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