Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1415659a9ec313c…

MALICIOUS

PDF

86.7 KB Created: 2021-08-12 02:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 001ad9890df17ae30e1e6324b9bab3a0 SHA-1: 65fafea76f8a0aef2bb6316bd6789e10c2c1ea1c SHA-256: a1415659a9ec313cdd25f0dd814d5c15b8ef10785961c22973a14681fa6b9c0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://tdbakademi.org/userfiles/files/pasokodawikixosev.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ffc2c843f---nixolobe.pdf
    • https://takipbizde.com/calisma2/files/uploads/vuwip.pdf
    • http://ponyomaru.com/files/files/rezaravuvefafe.pdf
    • https://eol.org.pe/ckfinder/userfiles/files/vebize.pdf
    • http://susutour.com/userfile/file/zisejirozuziwovetadej.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8811b455f4---xisinatawek.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874a833c297---5853357496.pdf
    • http://canavesiobruno-architetti.it/userfiles/files/58232139069.pdf
    • http://apsara.ru/userfiles/file/noliradaz.pdf
    • https://naucharts.com/ckfinder/userfiles/files/15064813140.pdf
    • http://escqatar.com/uploads/userfiles/file/file/foduwubimenazexet.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094acaa0fb75---buzizagilowu.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/42de1c5ecb4113dff4669a06b5070f75/zolebelotovasefewijaroxuv.pdf
    • https://cgeminfos.ma/upload/file/suniraxogemoduzo.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792a9a67c08---jigijoran.pdf
    • http://didopack.com/files/fopevagixeso.pdf
    • https://llsindia.in/FCKeditor/file/dozaripajonepuwof.pdf
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6328280064.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/j9q3hvoaibo7q90cmuukav00l0/xulutubujixoteraxoxopape.pdf
    • http://adaviestransportltd.com/userfiles/file/xojugebamotefinigaloraxes.pdf
    • https://aterhesseg.com/up_image/file/69746970469.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/69239445295.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7120180a7---24956018210.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa530ebcb---gawalerujojatozisibajen.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=practice+reading+passages+for+1st+grade
    • 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_off0000ef83.bin
e90e9eb54bce01c402ed472405e2e870de931da44b1e5f4a469d6466b92cab84
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 16880 bytes
font_01_sfnt_off00011b81.bin
cf1117605624d3704fe2ad201ae4942eb3e5be110dd67a578e87d24db2b4ff83
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 10800 bytes
font_02_sfnt_off0001345d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1345D 16792 bytes