Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cf04551aecf5f3…

MALICIOUS

PDF

90.1 KB Created: 2021-06-26 09:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a51e861ccb8191d1d5add59272cafdd SHA-1: 008fb3c6a3f041af1fb7d1726ba910ddb02928f2 SHA-256: 05cf04551aecf5f32406081b350f8587989ec6f0ccd6020202e7c7061939d450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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 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://emauto.lv/index/images/up/file/kamif.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609907fa5e3a6---jesezekakakuge.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd047ef12c---fixujadadiva.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949b96fb70---30733766641.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0607/082c6190ca24e7e37cfd49ac1a0c462d.pdf
    • http://nail-free.com/ckfinder/userfiles/files/texakewedemunojikoko.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a110853eb7---90064375948.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f23f14ed5e---66018671018.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231d9a0acb---wiked.pdf
    • http://urjabatteries.in/userfiles/file/mibimejibesuna.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606decc326e12---83155940291.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/84df682433856bda1f9fb1fa5688f9c9/88699093498.pdf
    • http://accessprecision.com/userfiles/file/35951672035.pdf
    • http://biancoacolori.it/userfiles/files/92515564711.pdf
    • https://cytairtool.com/test/userfiles/file/20210620_80412.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c684537dbd---8608297325.pdf
    • http://galettedesrois.hu/userfiles/file/50977548782.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/n444aabtnmlqg4b63q31b0q7gr/bugijexunor.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a666a94c3---87659207761.pdf
    • http://inimtrento.it/userfiles/files/61161792450.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7833ceb3---wipipofudabaxukamidetari.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/30a4f68e66fb8bc1b1e91772585a3748/22084587497.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0tv2m15a7n3ejqvk6jd67fnui1/74161075518.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a25930af093---lawaretakekiwole.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6978b8915---90438494915.pdf
    • http://wecans.net/_UploadFile/Images/file/puvijavomulezev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=re+starting+boy+names+in+tamil
    • 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_off0000fd2d.bin
db4d3f9ab591b552b92df21978e93afb20727805399d45b79795efe71a45a414		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 17500 bytes
font_01_sfnt_off00012a27.bin
6abc83e09c9ce2111929324995b6b4578e5e909787336b8ec10936c5f5aa0b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A27 10752 bytes
font_02_sfnt_off000142e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142E4 16792 bytes

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