Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90e5e5b75217381…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 00:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b20416f27a5b5ea9e0d20a1b07c65c3b SHA-1: f33adb420bcf659ea9b764cdeaa27a1f1b46c1ab SHA-256: e90e5e5b75217381d4131479a34210a3debd5664833fc4ddeb13826d82b54562
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. One URL, 'https://allytemp.ru/uplcv?utm_term=stomach+always+bloated', is particularly notable for its use of a UTM term parameter, indicating a potential phishing or spam campaign. The file's structure and the presence of these links strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://allytemp.ru/uplcv?utm_term=stomach+always+bloated
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609935d8e6464---46306436839.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/gm13palnuk0evcdoo1np2851f5/21720056296.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fee934f90---xutapun.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f9acccc45---tobur.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6eeb1783a---gurogufanudot.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfb8fed4f2---44487017954.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hvhd0be3uv4ck489uiltpq0sok/48303271520.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/j8tmp969e2jo2qgqrlnqak7j6t/bujumikubovuvibonapugixem.pdf
    • https://ludifrance.fr/userfiles/file/30392567547.pdf
    • https://appvid.eus/userfiles/files/68982296141.pdf
    • https://mldom.xyz/web/img/podborky/files/22348428490.pdf
    • https://nadamasristorante.it/file/97902899899.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/065cb959855d42efdfe5f8246c5a2e09/gapuvokujofopogavave.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adec7e01b7---18615427211.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81ed30b98---79227193795.pdf
    • http://geometrabottero.it/userfiles/files/67341083620.pdf
    • https://alexandrapanayotou.com/web/images/static/file/56032401885.pdf
    • http://jpind.pl/userfiles/file/1570849248.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/77075412739.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731147cfbe8---wevuduvobebujibani.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a347b568fe2---febevexa.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/17803899327.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/xidizefef.pdf
    • http://agnieszkapawlik.com/userfiles/file/wubazoweburevubuwo.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbb5e9ed2---boselobuzuroda.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/dc52ff69069c744695594a779b7c1741/72208763502.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_off0000f110.bin
f5527a519c0251e3583798aa1418bb7166181aa177dab9bf15daf61fb4647bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 10756 bytes
font_01_sfnt_off000109ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 16792 bytes
font_02_sfnt_off00012200.bin
a5af4ba9d5d8df5a9d1073815aafb271994a320a8777fb66b0f8d0e078910536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 17068 bytes

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