Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e639855961530d…

MALICIOUS

PDF

99.8 KB Created: 2021-07-14 03:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60d102008685aa5c858794d3305dc7a5 SHA-1: cab3f032ea60c4f3b28410596e870f12d44a5b3a SHA-256: 75e639855961530de84404923ba9c406e9a500a79fc25aa615296aa8a39c46a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, potentially exploiting them via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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://smidgel.ru/uplcv?utm_term=insuperable+in+english PDF link annotation
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/9fc71e1d6f288ba74976ecb3f61c5c58/16984192686.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050518383873499.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hd7vtek1sjiqlij2f4i6kr9u78/lafinilajasinibaxegenubuw.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/merogiduvave.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/4m3h0procq1rp2gaocql7loba1/wetilapofajodusuk.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd3eba859---kexanapugexeba.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f56f31ee5e---rujujewewagux.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/fiwalebumewilesagomem.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f39092fcd8fd4fea6880247879268846/92243113901.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608074c5ac1b4---17834960488.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/juxuwojowe.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/mejoguwadamiwo.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/65184875357.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc37ad53d---zururi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ef9c31ea04cc138054de364ab41b21e0/fofekiwitol.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/722122f6221c7ace1abb0c33b925a4da/faruwanegezebomimize.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/zasutuk.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a2fdbc46c---fixane.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf814aacab7---25844457613.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/43570585106.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/99961958569.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/8950180595.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/repuzetu.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/pusapiw.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/17577116371.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000161a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x161A0 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 24348 bytes
SHA-256: 29d10b14a9458f3920201ba98ae4de30d2144184c2e4e6ad4b96ead4c4476ed1
font_01_sfnt_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_02_sfnt_off00013210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13210 10504 bytes
SHA-256: 9e30191886430e6022fa2c2dfb32926acddfadd8a695d764fc753674e9d48d69
font_03_sfnt_off0001498f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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