Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4310bdb8dd79502…

MALICIOUS

PDF

67.8 KB Created: 2021-09-17 23:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 332d6be799f6171113d62d37c3e880cc SHA-1: 18f8a610c3dd50ba0b11017c331f0408f427754a SHA-256: d4310bdb8dd7950284382f73b549c1fdd5cdbabf61ea51aeb9f749e1c405cae1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded links, typical of social engineering tactics. The presence of multiple links pointing to various domains, some of which appear to be compromised CMS uploads, suggests an attempt to distribute malicious content or redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cesarrodarte.com/userfiles/file/meduvexonaxomubikeket.pdf In PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/26797613718.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/49809278445.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/69f4u9gegduc44i0ieisvhous6/votunesowimubowovena.pdfIn PDF document text
    • http://princeverma.in/uploads/files/83771078635.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/jutexowefot.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/diwepubegilusolufapolajom.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/503788450.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/mivinuwezoxises.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/natovitikawujedomuriwaji.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/88668755508.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/mizuza.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/vonutagila.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/40569832372.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5qsth3v53178otkmrbv14jrrqg/fagofalugegatisuvalukef.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/940c1c3a7f66ef3ea16a81e3e132446e/83630625945.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/22386279505.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/tegateke.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/rewijuziruma.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/61706085886.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/81998188911.pdfIn PDF document text
    • http://st03.it/userfiles/files/rosadegabewivulunegolu.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/96791946072.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6135f439bb9a4.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109080548199914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=finger+on+the+app+2+apkPDF 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_off0000b00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00C 13784 bytes
SHA-256: 5c24d558db2e7f9d47c5c546383a1128471fae061c2b16d8ba348346da80a0b4
font_01_sfnt_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 10504 bytes
SHA-256: 9ab21930480e43b8c3aae0672e924f4cef356696e88107572262b26f999341cb
font_02_sfnt_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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