Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac81ada239f741c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-22 22:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6721b3ff3aae4d9fdfe2b47ab25cc6be SHA-1: f78aa76f7ed02ef3e306faf0d8d3114a31de5b1a SHA-256: eac81ada239f741c1578c51add5e89f7f8f5ff031c676f9a9e4020728dfd33e2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context. The embedded JavaScript likely facilitates the redirection to these malicious links, aiming to trick users into downloading further payloads or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixel-pro.ru/upload/file/zuzokova.pdf In PDF document text
    • http://kaizousha.com/js/upload/files/sivinapowaferasenaz.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161367eb89e6ba---natukomiriz.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/62878229632.pdfIn PDF document text
    • http://okvin.org/userfiles/file/vamanixofef.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/purejujitofezurovis.pdfIn PDF document text
    • http://infracsap.hu/files/file/67730272064.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/bavotuxojekutodoxanirijod.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/72691888459.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/mituweboje.pdfIn PDF document text
    • https://polandpools.com/contents/files/fipeworizikutijanixoxada.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/gavepenaregawijes.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/lemivimikedopawik.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/79291324354.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e124dc072---bimoxanipasatimatas.pdfIn PDF document text
    • http://lactopad.com/uploads/files/85487480145.pdfIn PDF document text
    • http://lizhechem.com/upload/files/nefalibozepususot.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/82554108567.pdfIn PDF document text
    • http://rubensova16.cz/files/file/gejitasovon.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/regukoguje.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/61712690155.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0910f6b8---90962594361.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/2295807616.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/97636546317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hack+messenger+2021PDF link annotation
    • 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_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 10592 bytes
SHA-256: b8d274382fdf5778d413a47ae35cc17871dde51b0b1f8c808e1d666d806480d5
font_01_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 17900 bytes
SHA-256: ec67a12570854c2ec02614acda1a58a2468512f3b42e6876b4a0bd644521241c
font_02_sfnt_off00012fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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