Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8fcd686b86a9bf…

MALICIOUS

PDF

83.2 KB Created: 2021-07-01 20:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de745fbc897ab6c9f63d0b33d182d443 SHA-1: 368723986f27fbdbb8f30f87f118fed0c79c8649 SHA-256: 7a8fcd686b86a9bfff6dd8d705ba63cbc0e3a4c511d4ca80a3103c69591558a9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c437ff623f3---38267399530.pdf
    • http://novichiha.ru/pic/file/35338862193.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078407d855cd---xanekonigobanidikaj.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804eb31df83.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/700726bfcfdcaa48dba264f9b95a6a4a/widugiwebixivi.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/jn6dpufm53bcic4jpgjvge0ab0/nukivanakiles.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79191054502.pdf
    • http://otoozevran.com/resimler/files/31389872894.pdf
    • https://signika.pl/Upload/file/62226206673.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/fb7a726757d990cecae0de8d45a38192/58584860235.pdf
    • http://cepsagibyachtfuels.com/images/photos/74109813377.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160955da586b23---lejofilovejavar.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce857091cf9---vekileronixavufejamuzuser.pdf
    • http://grafiport.com/userfiles/file/46985986030.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607339de2807a---64415630452.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c20768b6754---livotujewexusu.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mrb2lj1fnuenjldht4fo2a3447/viruvixavanuwuweko.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc2d522ca---67906247851.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=o+level+maths+questions+and+answers
    • 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_off0000df06.bin
cb2d597af7125e26a84c3b292514d388d09dabe4c9344d0f579c57ed2f0d672b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 18240 bytes
font_01_sfnt_off00010f05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 16792 bytes
font_02_sfnt_off0001271c.bin
ea019da12cb42b633a2f565496a6c4aea5f9480dcd378b8e72923ab65f0d754e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 10936 bytes