Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f02becbc837254a…

MALICIOUS

PDF

84.2 KB Created: 2021-06-25 20:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27620b343b0c589f4b54fbff1a84402a SHA-1: 1ed43c585974d7ec6534fd133edd5a9bd1a48fcc SHA-256: 8f02becbc837254abcd9a22a602dd227c59cd0cd04c859fe8199e6e7b798493e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing by masquerading as a worksheet.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=find+the+midpoint+worksheet+answer+key
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609162fdd3ccb---dojematojojazimofubin.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/0ipl6svngq629u8v7bgid5t6c6/firojim.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088b29b95ac9---38983372950.pdf
    • http://transsnabstroy.com/userfiles/file/purevos.pdf
    • http://umrllc.com/userfiles/files/vexezogufukanezixejer.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8cdcb978---70259862849.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160921134bcb84---91666991500.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210510192738.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85be528ea---34098383364.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54701250e8---ruvikujofotoxu.pdf
    • https://kaptenhoki.info/contents//files/wesevi.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/m1u6n6grvqkuplb5aptgk53ck1/71035075771.pdf
    • https://baxsporthorses.com/userfiles/file/zidaguzigeturi.pdf
    • http://lltsg.com/uploadfile/file///2021061912294266.pdf
    • http://kaizousha.com/js/upload/files/32599720341.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808fb3d12a3---janufajepogumimozim.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cbdf1df9f---pulakulodepewika.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/58457593235.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fg1i70t6orgt4n3uvogspcokru/luxujajal.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb067ec01cc---gozidafakoxufa.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac7fe3fc8---79119933624.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/93075e39a457a7123736b36c47d09387/siwowizanuzomob.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/s4jfb8mgvda4v7aof7sj1iv9cs/wifiniwebixojajakobekevaz.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16095cb9512452---2101391340.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ea9f958c2d3f4dc5029759a96787890f/23013059582.pdf
    • 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_off0000e6d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 16792 bytes
font_01_sfnt_off0000fee9.bin
bfbc076db1839db0ebd7e030166a87e547bd747ba4768d9fce6ab539156888a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 16684 bytes
font_02_sfnt_off00012a77.bin
1cd37d1654343468944ce193679ee89fcd8178e7447959a8054c05019404adc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A77 10880 bytes

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