Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b04ae3c14626575…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 00:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0f15ff981f3513ba841d0ebc6fd5054 SHA-1: ee34935d9a4d13103ea09c629a78c6fd2f9243f8 SHA-256: 7b04ae3c1462657528595083c21334be9294f69b3e572ec3813cb06c1b018552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier also flagged it with high confidence. No scripts were extracted, but the presence of external URIs and compromised CMS upload links suggests the PDF is used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=filtering+day+meaning PDF link annotation
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c32e70d1f4d---91184102842.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/34540925799.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/doduzirefidujepapi.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/vubiz.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/d0imt6pd87ffen6q4ktopvl1o2/64883885794.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/71512207411.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c714a13f959---41206067620.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9f95360534356cc05f2a19de868c3c9d/binufixena.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/98762679965.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6a4b8208---6933581955.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/xemilovenejozitumif.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/26499910564.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/biwefu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1c7921a7810c4e60dbd10913500ca221/16088698629.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4101d25bed---66981699766.pdfIn PDF document text
    • http://moodyhighclassof70reunion.com/clients/2/24/24f6aee67edc386a60746049a176a33b/File/56819105153.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/37913903482.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/najebofapugosotowuz.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8098b1324---vutotavagazanaliw.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160aeacd8bb6fe---zijaxejagekoje.pdfIn PDF document text
    • http://methese.com/upload/files/26433542702.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dca01c34bc8---nanev.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609565764d2ff---ropawuxuzu.pdfIn PDF document text
    • 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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 18524 bytes
SHA-256: 1284e7d6781aec104884a62174a0fc753c8f5d2c3cb97ac6531fc2384c5c2bb4
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 10396 bytes
SHA-256: 4f0479326b8c52eac0f481b7e67e9014a4bce33a33dbf110cf955311641aff52
font_02_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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