Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f549455611bbd62…

MALICIOUS

PDF

70.4 KB Created: 2021-09-19 19:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f7f1dee28e70977bd1be3a45709fcd3 SHA-1: ecee820098283fd231e39f6d1f96d9a968f217f7 SHA-256: 4f549455611bbd626260088c42f86e5c42e797020dac33f2781e00af07f8ec12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://automozg.by/upload/editor/files/76472814061.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf1ed0422---mipelumazosuvel.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/zoxeluza.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/runup.pdfIn PDF document text
    • http://asqcert.net/files/files/ribevokanipiwu.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/jijasuni.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/22825882578.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/mevukiv.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/sopujumogodara.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/dewef.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/divaxudizupew.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f0fc1fc41932ff2824275cf7a2c0a4bf/72132641197.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/vadunepitoraxofovo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aac38231e1---gibimifovuz.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/45193079874.pdfIn PDF document text
    • http://afslab.asia/upload/files/60842231134.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/sesafiselozabifi.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///31093064530.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/vuwataviduxomajuxudimon.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/diwadegobegedak.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/13606693839.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/fasovidobota.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/7394236397.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/keguzunojoxek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=clash+of+lights+13+mod+apk+downloadPDF 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_off0000b2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 15332 bytes
SHA-256: 290fd8035c851a7e016c599e1065464618b7ecff470f507454ed78deb31560ff
font_02_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 11148 bytes
SHA-256: 10d1e813352230c64864acc62066d152124c70b79a1b72a2cb18e8786c6c09b1