Malicious PDF — malware analysis report

Static analysis result for SHA-256 80890ffa077d3e15…

MALICIOUS

PDF

100.8 KB Created: 2021-08-03 20:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c4d74fcc5f56c582278d9bb1aeaeaa3 SHA-1: 564e2c7a57e9778af0fa80b6be32cbe66cc7d638 SHA-256: 80890ffa077d3e15f60a97fdcf9b0f432e04cc060809389456ecafd729b522b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=the+twilight+saga+breaking+dawn+part+2+parents+guide PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940651d8ec7---41773452925.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9095d9cb1---fifuzejomaripiverefi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ff517adbe3b4ba47e411d290f72ff492/32210389171.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8816a48fa3c5940fed379e678ba9c076/36979455671.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/dabimarefomimox.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/kuxikadumorireke.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e5e46fd8---69949784985.pdfIn PDF document text
    • http://turnyras.lt/Files/file/89227432095.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/71a0843ae5705424aab0d794f563233e/jobez.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608795617ad59---sodivux.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/subesasejepul.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/vawabikugipisol.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/rewajodit.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-28/20210628111306545441.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fefc757f3---61050269819.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/87869987816.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/gidefarozonofat.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b683deaf110---mutulebo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/86edb583ac01435e25bffb0c1e506019/fotajolalugome.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9754080a1---xofebijipuwigosot.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/wumigutis.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/dulizexerup.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4ojp61vd4q6if4erqk4frrj6e4/bisuzijat.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/73ef5306ad371d0cd47ccc26e8da2f4c/58709335062.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/20546748958.pdfIn PDF document text
    • https://t2sc.me/userfiles/10233046296.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/19365948468.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 18724 bytes
SHA-256: d8c370233afbede1c0a88095e3dcb8313359fbdc344bf1ca8ecb68299275b385
font_01_sfnt_off000150e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168FC 11052 bytes
SHA-256: b8021f96185789162978e07842fc372fd44d75394ba321ec10105e26ab4ef217