Malicious PDF — malware analysis report

Static analysis result for SHA-256 18089a46cb2b9e48…

MALICIOUS

PDF

74.5 KB Created: 2021-06-29 04:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4635d933a1df3617deb3a6c7013a0287 SHA-1: 0d5eba0472c63630499015f52bad933971187f80 SHA-256: 18089a46cb2b9e48ce33a6cdda76a623d53d9a5043e82b21c45d7b0914f2cc89
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host and distribute further malicious content. The presence of multiple URLs on compromised sites indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4e1f03dd---xumaxerolefotoremejexilo.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e5a5d608---703679832.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb2c492f6c---60758626371.pdf
    • http://afgventuregroup.com/cfiles/file/wikiwefoxesasumifibevul.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec7b168eff---xolavuzoxijulu.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/fn72a77cgs68kduis2lr8a7nvh/10841724392.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6af1a5f73744f071b3a42a4f630feec0/28096180720.pdf
    • http://astro2sphere.com/admin/images/file/23614335672.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/zumeluvejajedapijajaxo.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0ca32a60---foramopizuzu.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2ae2b384444cb864a530bcfe265b4289/60447793044.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gco4sigtl0b564n5a2jnii7fv6/nubixitibuv.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16099efd3bc3f4---siwabugabudugapifiw.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607909efbe942---63004882962.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c70f69984e4---nigas.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a47e87e3---95806431769.pdf
    • http://gancza.pl/userfiles/file/ximigemesabisodetozem.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf341a44d1---39249790916.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/797a66cba63bb170dff53f6a065f84e0/toxalapufovep.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6c53ec3c1---8737090417.pdf
    • https://ahreco.com/uploads/news_file/pamesotetivazonobe.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0383a1830---48772134393.pdf
    • http://angelescare.com/userfiles/file/70900970379.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c399ceaf379---jewuwuliturat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=song+what+if+i+told+you+i+like+you
    • 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_off0000c0c7.bin
d7bcd1b6c4d9385a6dd95a4c2cb2d7df6985157b580b6c8a30b201560d7b1f14
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C7 10832 bytes
font_01_sfnt_off0000d9a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 16792 bytes
font_02_sfnt_off0000f1b6.bin
32ac432daca270cb6317c592c6a2acb886ff41479b7bc80ec26578f3b9f58cad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 15944 bytes