Malicious PDF — malware analysis report

Static analysis result for SHA-256 639b215ac3ea4b42…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 08:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5ab545a401406b3525fa20693c9b914 SHA-1: dd44e45aa4d46e7b2f887572eb9bec95cd1da903 SHA-256: 639b215ac3ea4b420ac1e514291fb2d4cce8827c39a008b552fd98e7980914d8
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute further malware or lead users to phishing pages. The presence of multiple distinct hosts and the use of disposable hosting suggest an effort to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/v6puj2ia9ku3f8evdcfeo4m9g7/juzerebepate.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/862acdc3fee6afc911ef1f39a0832410/50436893716.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37f8ce3cc46190302ce8a8a2afec42a2/26105231817.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c5e24abcb---85063452680.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729d23a864---43971225155.pdf
    • https://ms01bet.net/contents//files/zugofov.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/35cc36affd1713fac435d53770e187d2/fivizakisegasexipasiled.pdf
    • http://sungsam.net/userData/board/file/66467255792.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a703eda83be---puposowotagovepexolixub.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/69845891551.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ebrtuftl4kqb8jh5sf2qiosln2/sunatipukutararulufobala.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7a359cbe---73353457205.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/a5780a0263daa615d0e7ffc88f72d81a/58179874307.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b19219e25efe8557e09ca314b897d7c5/2613173759.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e710a107410d3e00942547bfdd5a8597/61884334304.pdf
    • https://chptravel.ir/data/file/43385896013.pdf
    • https://beautyyaurient.com/editor_upload/file/88615686084.pdf
    • http://curry-box-deluxe.de/userfiles/file/66715836449.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/12907ea01e76a6eb7d2424cc3dd8a0fe/mazuwalofonabupexora.pdf
    • http://massimobertoarchitetto.com/userfiles/files/gopas.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a525d469e6---xafofenukuxugepomomikewu.pdf
    • http://entryexpress.online/chapter_images/files/wadaxozopipuku.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726582935fa---98206028546.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/8d029f31331b694b0f00afce87f25020/vepabesajirefa.pdf
    • http://gadkowski.pl/repository/filemanager/file/17541922842.pdf
    • http://hanhthien.net/uploads/file/68435860700.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=passive+voice+with+get+exercises
    • 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_off0000ed07.bin
2cf919ae77e892fadd35c58b84d47e2c3273e83f5f4117aa1e7c4535e5c1ca38
pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 17012 bytes
font_01_sfnt_off00011921.bin
e95c4f80c774d406945a1ff09057581e708e3e3d7606273a81c421410d03966a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11921 10616 bytes
font_02_sfnt_off000131b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131B1 16792 bytes