Malicious PDF — malware analysis report

Static analysis result for SHA-256 f867fd94a6b7b916…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 22:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d60093e061d4abecdde1b17f8042e66b SHA-1: 79ed4fa61d588773349410a928ff5bca5a1e65ac SHA-256: f867fd94a6b7b9165bf89f78e59c2437d928c4bf0416b4fe1574d1c1498c7fae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9614dc4acc---85372633284.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f99818830da---voperegavawozetugev.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///kokanetopegal.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/96754379760.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/69646351216.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/hcthkoi8tg983kqa65kubseqe1/gozizufomodufuputarukun.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/31165516171.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f242a135e30---peziwujonopaxizexunebufuf.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b8c912f19---94180169834.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/kuzowumikogewoledunatidix.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/kobarinulupozew.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/80749990069.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/45469298634.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/ad6b44fff608527378dcec19694a3768/regubonofifaparelap.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nrc14f5n78v4ivh8t7hlo7a9dn/66595658441.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/58230597929.pdfIn PDF document text
    • http://splogservice.ru/content/file/rudetikin.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/41563242632.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/45998468721.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/mivelolenujoxenuzawab.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/78876230763.pdfIn PDF document text
    • http://kgmda.com/upload/files/velewarix.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/koxiwow.pdfIn PDF document text
    • http://canadanur.com/resimler/files/ribopotija.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3af3ca0f02---70446891204.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dm9cl22nrh8s7voki0837l3s92/kiganot.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/19665ebc90ea082c5d3ced657ee54bdc/17819129852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=elevation+of+boiling+point+class+12PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 10916 bytes
SHA-256: 8dd8765dddcce90c19be49f35d782fa54e34d737069e042d35161783019afaaa
font_02_sfnt_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 14048 bytes
SHA-256: ae82b6f3a4aeb37dbc94b8f1f341749627721d483930b258776e2222f0af9b46