Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c23117035096ed…

MALICIOUS

PDF

92.9 KB Created: 2021-06-27 03:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94a87c713d8da9e4145dfc5af792f832 SHA-1: f5cf97e8b64541753bf660912fc2077091c40d07 SHA-256: f8c23117035096edb9980ad5acf14501d8cca7ba776c7c00f81ba47081d9d522
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a URL with 'ms office 2016 crack' in the UTM term further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://cn-polylysine.com/d/files/74851491306.pdf
    • https://cape-electronics.com/media/file/zijepebakaverili.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d31572c23---semetevopazeno.pdf
    • https://serwisnawigacji.pl/userfiles/file/ginibedokepilijaba.pdf
    • http://gyobel.it/public/file/30970698672.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/nm4nngh84g4la624qvmj8u4td9/vatoduzemuju.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160756c8d538a3---gupumopagem.pdf
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/52453303122.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73403a0c2d---11024085069.pdf
    • http://sosnovgeo.ru/userfiles/file/45235115698.pdf
    • http://status-go.net/gfx/userfiles/files/moronaje.pdf
    • http://poiskvod.ru/images/file/golibazupetinexavuti.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efdaac5607---65168512184.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7b11f787---kigozuvasewepuxewidagumi.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e628f59a4d5461be5ea6282ca8e0bf7d/xixedaxipazasaxumibi.pdf
    • https://anhhuynoithat.com/asset/files/79501543287.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d8d132dc6186f451d6d63c7249af32be/bidagavukojomor.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/69267071886.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7535ab27e7fc3f30f786e740b4816c9d/83173109042.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hrq9m6b2aiqs01pp8csdoo6ef6/wefusikasu.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/580da272380aff8c6f81bfddcade004b/ponovevitilewizaket.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/812197b1c03673da0ad95cd8dba49d99/molewejefikatuzolo.pdf
    • https://citronixdeflection.com/nbloom/fckuploads/file/79174823251.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ms+office+2016+crack
    • 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_off0000e1f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 16792 bytes
font_01_sfnt_off0000fa0a.bin
6527ce612e0d91f03dced1fc76aae3cfbdd7e7537a37cc188e8f65bd479b7100
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 30760 bytes
font_02_sfnt_off00013608.bin
17d8f157aa7c331a418636bdd94e1c51351bec4493b26b40f113c70cdb5f3cf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13608 10628 bytes
font_03_sfnt_off00014ea1.bin
2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA1 16204 bytes