Malicious PDF — malware analysis report

Static analysis result for SHA-256 21773b650c40fd56…

MALICIOUS

PDF

96.0 KB Created: 2021-06-26 21:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5624b51b14c895e12109b44e8af4154 SHA-1: d68e381c57e6c1f2e98a81c0d203042284d80b88 SHA-256: 21773b650c40fd569978f34c9b8cb14ed2e158444637d87e01cfeff1ef8a0507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. While no scripts were directly extracted, the nature of the URLs and the detection names point towards a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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 http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d221cde1f4d---zefif.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/u6jsum9ppmdd53csgqajd2u1dd/texagobemomixalaviv.pdf
    • http://adabaskimerkezi.com/upload/file/kewupipadotapalu.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a2c5d51f8324fab99f829da0b61d2c88/xetuxilepulobakisozir.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dcfa165df---vaniwenileliguzeronuru.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5902507702---silekeviwonovev.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/eaf410715b624d2570fe784011da5b05/nodivemosetubu.pdf
    • https://mokhalasati.com/userfiles/files/15486769248.pdf
    • http://scales-center.com/shop/fck_file/file/vugodenutagi.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/fcdf724191a7f621ffda420533a34a6e/20980752001.pdf
    • http://lumieretvie.com/userfiles/file/xudoxozol.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1c51e6e494807f41f9bd6396b7d1fbaf/48823384189.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c396eb9bcdd---subuxojuwakejilom.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd27e9c07ac---jalutetoponefejobure.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe96adc499---24904295272.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb61adcca1---92550675178.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/33f3198718856aefb82bcf7322b77beb/mosorele.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/u53tv9lr0ch6f9humh1cc4nmcf/27027033182.pdf
    • https://alihuata.com/userfiles/file/1108737757.pdf
    • http://vom-ragnaroek.de/uploads/file/40958372073.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef0a4da90---20853825947.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=plagiarism+in+malay
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a3dde2be75cf95326eca7e4ec363250e/lorujidukisujixetevetasof.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5ef576766a3f7617065d284aaa80654f/45541083417.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000104c1.bin
fe1285c388e5bcc4cc88052cf0b5dcf948b8b03e4410678b0e86cead895b1e4c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x104C1 16980 bytes
font_00_sfnt_off0000edf7.bin
b249c7e6c395732fe056aad8acb74118fc277d1f95896527e157d3e3be0595c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 10216 bytes
font_02_sfnt_off00011d76.bin
12bc4b638a91754027c7f9ac347ceadc36821a312de6f530bbdc380852ae35da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 2436 bytes
font_03_sfnt_off00012818.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12818 16792 bytes
font_04_sfnt_off0001402a.bin
d4a84b5ad801fb1f1b2d916492d1f13e9211b47f67841ec3aab2794c63594d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1402A 19448 bytes

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