Malicious PDF — malware analysis report

Static analysis result for SHA-256 147cd81ebc695ecf…

MALICIOUS

PDF

87.5 KB Created: 2021-07-28 11:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 882a3aecf02ee0a83412b137bafbedd6 SHA-1: f3a62af59e411258b4afd973df13a1d96103c46b SHA-256: 147cd81ebc695ecf811c17608e27b87ef9a522a4316c0d60c82a2d88e9c854a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://sabagdasarov.ru/upload/file/zuwewoz.pdf In PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/84435411630.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/5c16o4tov15fuk2btia3e9ndo4/86773255472.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/wadexuvafegawezavares.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/b10pc8t62m6gqjpnl5dmmb893d/woxare.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6bdf8501a4ce3194f1d88d6dbc671b1c/kogujaponuxonogada.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/liteto.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9585b32034---64155824163.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b6265bf836191903a174aa6a52605028/tapavak.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/45071545206.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096863113bc7---tinevo.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/bofejoruvires.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/xudosori.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b29ad14540---90669122492.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/31577660435.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/43593081675.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/27466519003.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/a7ffd991cb79a67fb72d5a786985063c/97766720979.pdfIn PDF document text
    • http://oklogistic.lv/upload/file/kafelixezarafut.pdfIn PDF document text
    • http://araonline.hu/uploads/file/71565869379.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/42262754178.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a876c4dfd---kewizeviwowu.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/mabewip.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7a2evie50t5jsudvvu0nflt1jp/95019762514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+amazing+spider+man+2+full+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_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 11268 bytes
SHA-256: 227b1a0c62709d16c82b737f7e5fbc7fc7e9bdbe8909d5ccdb65cebc0d05b374
font_01_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 17968 bytes
SHA-256: 6cc51c8c9caee01624cd5a4408195bf34e9d7596b53231fcd2f616ba589fa8ee
font_02_sfnt_off0001373e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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