Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ff01b7fc40c431…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 19:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e69e9290ef85c356752e490af67dc38 SHA-1: 65926f0d6aaa6cfc3e49b281fc0b0d1f08fa3e77 SHA-256: b8ff01b7fc40c431c0038df60cbce1b15a6b4d8ccfdd19ae2bf712d92d608338
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous potentially compromised websites, likely for phishing or SEO poisoning. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to leverage disposable or compromised hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://pereplanirovkaoblast.ru/pict/file/widisamidagepobo.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2ojkfusm9pma372dhhu6n44uta/xovupo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1ebb4cdf663c2789dd284e0e48507851/15715375786.pdfIn PDF document text
    • http://ttc-investco.com/img/files/gitomuxalotigufixi.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/69196503880.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730d723e195---53972431779.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/36337662367.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aae0f599d99---34326101854.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/492978600.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/nusizibijatuvixuxatuvi.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/73249445039.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6bb51c4a6---27254736585.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/nefofeje.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6147b3ef80---tumok.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/23902744793.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/51305612232.pdfIn PDF document text
    • http://prosquash.by/data/favikumujut.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/17b3d2efa3a372cfbe01879cb4244c39/jesidirebujifoxapoganalu.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/rusiwedunuzu.pdfIn PDF document text
    • http://ceroki.com/image/files/83556535630.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b287052c---67772562259.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/pinevizujovat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=trias+politica+adalah+pdfPDF 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_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 10444 bytes
SHA-256: a7c5a93c51a215180c8202d49bbd6deb43d0fa049d0276e3f038bda022334fae
font_02_sfnt_off0001141c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141C 17684 bytes
SHA-256: 6ffc3786ecb693c4fd1515c9ab322b1789c310897b8602a8d5195a004857e10a

Open this report in the interactive analyzer, or submit your own file for analysis.