Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e8a1cecc739c61…

MALICIOUS

PDF

115.7 KB Created: 2021-10-09 18:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6012587ca6fd689805790e0b2376535e SHA-1: 755556dfd6ae3a06fd5eb4d88810de1fed70ad21 SHA-256: 73e8a1cecc739c61b480410509bed9459d314c44e64cd0aa0cdf8a36350f3030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://philabc.ru/uplcv?utm_term=clarence+over+the+garden+wall PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b321e1467---xewebal.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210914/files/20210914065133.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/46013836904.pdfIn PDF document text
    • http://robbymakka.com/userfiles/file/zevarepolujasozoxatewu.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/vadikinazipezemifafirojav.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/99812560974.pdfIn PDF document text
    • http://adice-area.com/pictures/files/42840109643.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/09863c2a6f169faf82d196ded57d1800/11657033994.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/5803193218.pdfIn PDF document text
    • https://pansky.ru/UserFiles/File/12484347750.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/51acd3d10da35b305cf81e7a14bb7cfb/55469484040.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/fimizokuxenetid.pdfIn PDF document text
    • https://panama4d.com/contents/files/1757100669.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/rabikapiluwelinasonuveve.pdfIn PDF document text
    • https://rajaunited.com/contents/files/16746626645.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/75306498540.pdfIn PDF document text
    • http://gnox.vn/upload/files/goreposobeloluli.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/67347285747.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ea321ea7aa66d9f4c137a6fa649c9b9f/virigovu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161603928a5b73---13815351907.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/xapepopimewebadotabeb.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210926043039.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/75600584849.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161616f18a7a23---90963109906.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/9535942827.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/31359890292.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_off000158c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C3 21236 bytes
SHA-256: 0812093cf3759bb4851f9017d574c6b1c9b9e6635c44888c14b7345cbb23c92a
font_01_sfnt_off00018f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F61 10572 bytes
SHA-256: 0bb51261c967a8031c1dbe475438010c4d8b0e489600d9b3b23ba086fee6fc12
font_02_sfnt_off0001a754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1