Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e448e8565bb04bf…

MALICIOUS

PDF

88.3 KB Created: 2021-07-23 15:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73172ea45028dfd7d8a2f13395bb8644 SHA-1: c3403282291044de62a3db23bb6cd4ce7f3dca1c SHA-256: 1e448e8565bb04bf9f9463acdd3b11de273d5cc4c7f7cb395a3f6eb2e1a333e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress upload directories or disposable hosting. The document body is unreadable, but the presence of numerous external URIs suggests the PDF's primary function is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://asharfilalkulfi.com/ckfinder/userfiles/files/16514857856.pdf In PDF document text
    • https://asthasupermarket.com/userfiles/file/398514072.pdfIn PDF document text
    • http://btfa.tw/upload/files/jafumopexasutamuwudisa.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/71bebf672727a0d16ca0c64798389698/96819199131.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/54369582709.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/rukewukepolikokitukuwizif.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/10a6513683d2425edbb7dac3dc7d3883/84307390188.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/30253168053.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/13614203731.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/037g6qtupd806k9kf8feos5r65/ranig.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/11163322880.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94b041ebb---nokemigomefoves.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/10554986080.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/b78a12ca5b60e94a52ec051f7ec597ca/lobumifeta.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/rizubudikokejapi.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/lakefurina.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/rupujadetujofoxixa.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210528183613.pdfIn PDF document text
    • http://ttc-investco.com/img/files/5359655133.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/38923125216.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ff84146cd---niguwo.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/xegavorizuw.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d3831c81b---37406847575.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3740b08b---raxenitiperar.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/caa0a0535b185afd29b9194d2eb67104/78147275320.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f42030a4a15---36720465747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lullaby+of+birdland+piano+sheet+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_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 18868 bytes
SHA-256: e8b2455bf16775bf9fe7684b88cebffdb9a452250c8d6f587512acc0a82900c1
font_02_sfnt_off00013abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABE 10904 bytes
SHA-256: fe69fcdfa73e521953cc8d256fc39bbcacb9b379fd170f7b04bde82cc040c4d5

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