Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2853c34d345cd5d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 04:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 01ffde16a7f0543dce6e4e565e140089 SHA-1: 74154c04c02c96862fe55b0d841dc8aa263169ec SHA-256: f2853c34d345cd5d71e3c5e78d520c4548557e782093434a0cb8490ef3a69d1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS upload directories, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://arnetbilgisayar.com/upload/ckfinder/files/novagegigebuzit.pdf In PDF document text
    • http://agrobud.net/uploaded/file/jevetajaletimuvavexuju.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7834495e73---89525173268.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3a99d3fd7f6724c9a4be7144bea32cab/jevapidisigamufabilu.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/gixaroboxapugilawugi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/malejugiti.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/9lm3udfp2bk99topgdkl3anlfa/nojivokox.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/98462064493.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/54961908048.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6f60a3a4f3a91b2feff1bf57fcee08a7/xujanejamososur.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/53b0c284e0563edd1581b3dc909742c9/zigusemidotesabixi.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/dazozipuxor.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e9d39eb2---93042196033.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/mopizavuliwotovep.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/sawiripewokudazowafes.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/vajuginupewi.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/46938839120.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160835090c9587---30319249743.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5a3d8144---66126565193.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/27267451900.pdfIn PDF document text
    • http://hongdacable.com/d/files/42364283459.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/62787080111.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/xufetenopipuwawipaw.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/65774861314.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/luxojozulipew.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/xugaba.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0fff799ca---28591991610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=machine+learning+with+python+pdf+oreillyPDF 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_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 17180 bytes
SHA-256: 187e2207f3f8a5c0042a4d352b4d21b1aab48dda2a5699c28494a36be02a4213
font_01_sfnt_off0001177c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 10924 bytes
SHA-256: 0b39c249a072434d20f7a24666b1023e44f32accab4a5c46775dfff43039eb9c
font_02_sfnt_off00013097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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