Malicious PDF — malware analysis report

Static analysis result for SHA-256 839e011afd70591e…

MALICIOUS

PDF

94.1 KB Created: 2021-07-31 23:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8db66df3e95d1a524ff8e6fc2e87892f SHA-1: a5f8940c11dcdc4e0c8bd3fbbecbec3d78f62a39 SHA-256: 839e011afd70591e8247ce1e2efa6776dcb7d9b6c7a3362af711e289b658c404
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://rotterdampools.com/contents//files/samuxi.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e10c313f1---69454299388.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/47161508083.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210708064410.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/38342954565.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607442dfacc0f---8689562384.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/94491930955.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874e9af3600---38491364841.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210517045341.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/negajotajifodimalolosofi.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/tufinipevibezo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fd96e37ab2f---gitosexovomavemaxoj.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/94186973859.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/zusosagadokudivatirimini.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/nufed.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4571a3a14---14537745596.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/nivadabomobenides.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/4e469800d61633a50bf1f14cecd5cb30/gevob.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/94194642039.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/51073510694.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e0db6decf20---nuwosarimojimegupilafu.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/79843400852.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/49301507414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gta+vice+city+cheater+apkhouse+1.7PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000109b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x109B5 25916 bytes
SHA-256: 2e4622d5fedac5fad8561f46507a473b5849b71353d96d6562dbd362035b5cea
font_00_sfnt_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 16984 bytes
SHA-256: 13685c551123b50c3453e8dbd59253729e84225d6a2019ddba6aafbae04f1f41
font_02_sfnt_off00013862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15079 10900 bytes
SHA-256: 0d13452dec238e2166500eecc449553a650059ee8bd9bb9298765a420f987e96

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