Malicious PDF — malware analysis report

Static analysis result for SHA-256 109f3ccc0c560cd3…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 23:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1718658fb259c9ec68ed311f7fce8fd5 SHA-1: edaaa73498d1b6a96d09c3a57e0a746063e03861 SHA-256: 109f3ccc0c560cd387bcecdf69066a1e149a1083f99928e7b7f575a510cbdda6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains. Heuristics indicate this is a link farm, a common technique for phishing or distributing malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://energy-labels.com/userfiles/file/20767756583.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ihjjlib1svtbh9644po9o7vo47/sosutediwuzowodupunoz.pdf
    • http://ajtoablakcentrum.com/_user/file/dixow.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606fcdbf3f371---44696055446.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cd6f600f8---91977307744.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c4083e796e0408699862e590c5105493/mogajovatopasenaburim.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/8546155c332f24d46601de37e363431b/56241028544.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/3adc01fcfac94fab7d9d8807c215c5f2/43546252389.pdf
    • http://blesk-stroy.ru/userfiles/files/jisenuvopoxofopupo.pdf
    • http://sskj.pl/userfiles/file/zujujodekovorurekupijomoz.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9c17df9f2d58af381eab85023603ed0d/65717719861.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a8e87360247073f71178e1e24ad02435/70322094665.pdf
    • http://palenice.net/obrazky_clanky/file/vamifuwopi.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b62cf3bc8f8---22667486940.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071828d3e24f---86025521626.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7071f277f95826ad920e19771f7f7f55/31336706923.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6b3c6100fe7b5e1410949496177b7759/12974683512.pdf
    • http://greenld.com/userfiles/20075280704.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace58a50890---fotaxexukivabegexusek.pdf
    • http://alphaconsultinggroup.us/vpw/images/file/69443825920.pdf
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/53939963540.pdf
    • https://duproject.com/uploadEditor/files/morepuzuxu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd0f2cef1d---ralusururafi.pdf
    • http://wooshin.kr/uploaded/file/183471427760a677f26957c.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+thick+is+a+us+penny
    • 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_off0000ebc5.bin
6d508def750340059d4497ea13eb34a883ff72243856c7ac205b4b7900088d94
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 17868 bytes
font_01_sfnt_off00011a7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
font_02_sfnt_off00013292.bin
9e237311eabf827ae6dc84fb3ee62731f4119176f01db41672b287d1e3e3543b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 10708 bytes