Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f173089f8735f74…

MALICIOUS

PDF

87.0 KB Created: 2021-07-04 15:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a95a1975cb2a476666e21c6a58169e5a SHA-1: 8c4ac6d9053a972543c66cf9909d05986751176e SHA-256: 9f173089f8735f74dbb7e30edd6211ab14148075227da963f3687d717d7170a3
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to distribute further malicious content or facilitate phishing campaigns. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to manipulate search engine results or lure unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://mim2010.ru/userfiles/file/muvolaxomozidunox.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd36c449c7---pafogezini.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096ae3bb76d4---83361245742.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b18207039ba---71949284751.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/b726c92f0df049150f4e8c6eeff3f260/jadujavinagoso.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cbe065d5cdde230732cdde1bd6c2d564/3440345353.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c35782065---92537311266.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12fce2433---51944916836.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5eef008bf---56831794360.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b71fd38bc---nulatax.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc4a445cc---zodasoxikatisutovugifu.pdf
    • https://tenfci.org/userfiles/file/54418470370.pdf
    • http://berbun.com/user_img/file/46586073323.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/u9g44of42shlb1qa1q9ksntl14/rosidemin.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086e35f28b35---88467407221.pdf
    • http://hmconcretemixingplant.ru/d/files/92284719895.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f1b5c1803---wolelizegufejolisaxujajag.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8906b82ac---gawosizemaburezaz.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8l791fajtfci12vl0bp4udug6u/2440191684.pdf
    • http://wu-pao.com/upfiles/editor/files/61201105774.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/7httn9117kifus9aeadhev0fum/gajafon.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1f09d8285c440ffd6d4ea1f269a1900b/gugabanebusaget.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607153a3c9b6a---kuzamu.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/eff4e5df47ee5048ebb1b04350b6266a/48747704839.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=101+essays+that+will+change+the+way+you+think+free+pdf+download
    • 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_off0000ef66.bin
b8049c5aaa7bb65e5ac7e7e43da98d2e8aef20dfc5a2cb361f850bbcc99401dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 17052 bytes
font_01_sfnt_off00011b86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 16792 bytes
font_02_sfnt_off0001339d.bin
b19b848193e3291efac99c55b53f2e27ad87c09de5a0df17b567b56a47e6b09c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1339D 11368 bytes

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