Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21f64b3f259fb47…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 00:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85e0194228484305f577de4024c65480 SHA-1: 17f8eb109917ec66708ea108685fcefabd7fc30f SHA-256: a21f64b3f259fb4726668286fd16ece400edfa43fd00eef1a47410009c6d675d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. These links are likely intended to lure users into clicking them, leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=annamma+jacob+obg+book+pdf PDF link annotation
    • http://t-p-fortune.com/userfiles/file/29429029746.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/31667618939.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/pepikabifezujebewarutasi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f705c28cf6---wewedutubelowupupipeba.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/pebanuzitolaz.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/76436702329.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/58950569968.pdfIn PDF document text
    • http://prosquash.by/data/95946139699.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/nexevolotomurolineleju.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/9879221525.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/1de45pkrv5lg50h8mdlasrnpb8/59803207953.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/10746503602.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/30852619558.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/2445907203.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/26317319874.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/33496120327.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/af97e7d63f72ba6159d900a972c07277/pivesesavidapu.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/197614808.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/mivenusu.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/sorozugokinosogupijinu.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/dizominesiwizarutomudi.pdfIn PDF document text
    • https://citytrafik.nu/images/file/jikaxabate.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/bebidigow.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/4080894563.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/q3unblaqmkem802dikbd86o80n/masukomumufiduliru.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_off0000be42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE42 16616 bytes
SHA-256: d59733e472a187acd0d58160c0f2ca802dceb727d2d0a35a12bbaa091d58e508
font_01_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 10668 bytes
SHA-256: 56a42cf104d9d21468ad57a132038eae7da8c8b19befaf03cf5720a70740a7a7
font_02_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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