Malicious PDF — malware analysis report

Static analysis result for SHA-256 af83ca8bea28cc78…

MALICIOUS

PDF

88.2 KB Created: 2021-07-12 17:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1b7b470bf5e67ec2d3bcb8572bcc25b SHA-1: ed07f926f06e16d66e43ac157bbb370c0d259bb6 SHA-256: af83ca8bea28cc788cf8ec591d01b31d1a8f8718ba89e909f948390c47d6e728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many 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 distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drjoecarver.com/clients/49355/File/9119966977.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9e21095c6---bapiregofinejaxok.pdf
    • http://ithaca1962.com/clients/41687/File/jukinuvepagekajexud.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe2c1ac32---5009493618.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/petusawimikabujigux.pdf
    • http://dailymaytrogiang.com/userfiles/files/rawopozabojafu.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870da689395---7750369450.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/fb550279f8b0ff78a741592db396dd47/dulukuz.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd885b1b9a1---susaja.pdf
    • https://ludifrance.fr/userfiles/file/68015427653.pdf
    • http://goref.ru/files/file/35548479990.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a25ee5e10d7---38887652816.pdf
    • https://studiorampinelli.com/file/91048402012.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078d54098179---xunusoteg.pdf
    • http://nfc.soo.jp/file/fuxarakowigolo.pdf
    • http://pierrevillers.fr/mairie_files/file/tikusufora.pdf
    • https://tipresentoio.it/images/file/jurafanodugogo.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/jerosulatuvexokojevor.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1afa17920d14bb4f25e77611d277e498/dokuvofivamubavini.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6673474b51d0ba07559f8aea0cf1aa6b/38012676255.pdf
    • https://xn--80aaijzh9b.xn--90ae/documents/file/wuluvabusobitawulezax.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/u904sg4k72f654i2298ef8a9i0/80038235113.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/397cddb1d3c51ab4f0addb92a2123a6a/63724643453.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=white+lipped+tree+frogs
    • 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_off0000f407.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 16792 bytes
font_01_sfnt_off00010c1e.bin
1462e3c6add6ee24aafad1f5d75f13c388a1ab73ed5ec90b7b13b0015b497915
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 10504 bytes
font_02_sfnt_off000123e8.bin
2bab9a8e041b75ccf9e93b2752305f21f2a33131da117a94692cd9d2cd76401c
pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 18444 bytes