Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d10d66f9fc66b96…

MALICIOUS

PDF

94.7 KB Created: 2021-06-28 01:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 167ae7cb90083009d28e69dc60398d63 SHA-1: cc141477c2801ec5e968435bebedf36d29c5ad21 SHA-256: 9d10d66f9fc66b9605a6b695bfe681a772b0a0a45b070ccf323bff1df46d9c78
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad84ed6451c---vanexo.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8d55986018e8f406e692361efdba0f7e/jiwubod.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/db84f3838384481320e12a2dbb902621/63782754124.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/7e7c619ed921a0b34fd6ffd4385dda2e/superezezitefobetiwubo.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d11ec13d---42265715701.pdf
    • http://nanumed.ro/uploads/files/buxulizilixanomedup.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd3111414---71161012603.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/navotuwobomimufogipab.pdf
    • http://bobmeetin.com/media/galleries/files/nobexawosulepodati.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/osn0h7rdjlk1jqj0138fubhf3c/62118073558.pdf
    • http://www.aadhar-interior.com/userfiles/file/jenexujifawebafuxefozejap.pdf
    • https://ebooksweb.net/files/file/41195966585.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/wanizukinerit.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d5d710ad---dazajukonewozuwokolufugug.pdf
    • http://pekingtogo.com/uploads/files/70636860546.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3112692145---viwupam.pdf
    • http://amandamaitland.com/images/file/86917008953.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/d1i1nanqn58ibts36v7sqng38t/79935205306.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/169535ab618e324e45a2cf4397e840da/16918339908.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/43c1cfe09823792fe71630e318ea998b/bozaxowitugemum.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d3c8b081---kutadariwebi.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6e5ad574aff83bf6a84b9cfd42ee8e57/63940906589.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea7f97cda---45947840588.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1e93f093b5b4b69bc649643f2f10ded7/14851576371.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=got+a+feeling+that+i+never+ever+had+before
    • 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
font_00_sfnt_off0000f6ef.bin
e4926723bd323012b5f69d21c257f35b3a0ff3adda01336738dab2d231ba8a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 10708 bytes
font_01_sfnt_off00010f3a.bin
9dfc495d74263a4fd14d05be7bbea270dcb8e344787e4368d9ad5dfd6acf2e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 17284 bytes
font_02_sfnt_off0001288a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 16792 bytes
font_03_sfnt_off0001409c.bin
341927dc58beb9fd9236d88d193d15e2cebdb8a852fe65b0ec8e025b40c4dc0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 17024 bytes

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