Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b3fc910c2b7232…

MALICIOUS

PDF

99.2 KB Created: 2021-06-29 16:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cab8e2b6a8c371ed83951961d94406b9 SHA-1: 3f11c3eca79b9a396741732c6b2a1a28a97569b4 SHA-256: 37b3fc910c2b723272a7d57d1f29877928f8fd100950b24a3296e49af9e676eb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or manipulate search engine results. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://alihuata.com/userfiles/file/xomasipote.pdf
    • https://travelsafeway.com/userfiles/file/40697662493.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/429a2ee45eeabf25d130cc33923944df/6614341142.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160829c4386c3f---63761871890.pdf
    • https://baigiangtoanhoc.com/upload/files/60676675527.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1255e9e5---zudegupakol.pdf
    • http://mamnonlittlesun.com/upload/files/89374677589.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/73859775323.pdf
    • https://geneticapanama.com/userfiles/file/witezaroma.pdf
    • http://ccswcd.com/userfiles/file/25515057765.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd16f1e56f---gugetitejisodu.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098493f16d6b---wiwamuv.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/031feb3e10d8eff27b05a5a168ac6c60/vobigonu.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f92d8c980---lakolowafonugux.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094227872405---39623548473.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f02f5892bd---rogaburobeta.pdf
    • https://rajatotogroup1.com/contents//files/42285591533.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/p31o2bad3sun4j104pohho04j7/libosajibununatoxa.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083281ef1b86---wovunukewivaluribalepi.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/dcebd42d1e1b45edaa812d415dc0e181/zeveloretozimesis.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d07f8ebbd4fbbb26104843ae1c953955/polimadix.pdf
    • http://location-appartement-venise.com/italie_documents/files/tibonivorinimikud.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb242efd2---5205531500.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609619157483e---kiganorawise.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vehicle+color+recognition+using+convolutional+neural+network
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013b12.bin
186ae3aa72ec0968eaf3276e60b0b184b45104e4740f005a00d077f2824b1047
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13B12 23956 bytes
font_00_sfnt_off0000f451.bin
0c34acb3420da5e1c9bd070d4667a52dc291d200570762c0183a11471cb1635b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 10820 bytes
font_01_sfnt_off00010d5b.bin
f1a77f6ea660da1739e47fad70d2b90874b812d2daf38aa5b6a8bb7ff10527c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 17484 bytes
font_03_sfnt_off00016618.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16618 16792 bytes