Malicious PDF — malware analysis report

Static analysis result for SHA-256 2001faf10357edc5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 14:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23eac789930dfd6c3bc8155a78518764 SHA-1: 532cb4cf9259ae9dc91792371bafc0af7185d915 SHA-256: 2001faf10357edc5beb35d3961d2bde259a2f8bf4cfd4abaaaa28519ddb8ada3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=view+list+of+worksheets+in+excel PDF link annotation
    • http://iltorg.ru/upload/file/34168093102.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/51698248609.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608349c2ae0ff---14217227232.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2d9051c73cb4a4921bdc01591a1f5b45/63064393197.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc12eabdf5---remeti.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/19783084254.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/demejexe.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/j9q3hvoaibo7q90cmuukav00l0/xulutubujixoteraxoxopape.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/nononasakafitiwefu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9163189333---zebiwalog.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/lvphvbh04p6k569b3nh0qmdt86/xumamitobutewuvunesenedu.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/4279798748.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/58985984680.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3944c7f605---wavulax.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/gurofesasalezesabanuda.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/dosebatobuden.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a476e0c1d5ced7db4e29d872ef5138a7/xakiwuxawopogetawi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0592092ee9cc11f2f45f3a0c7a028074/82277455330.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vu1k4ljath10fblv1ct0hc5nk2/wijojewitememivis.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217161341563565.pdfIn PDF document text
    • https://davnosti.ru/upload/negora.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/24327211636.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/sapizeluxes.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_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 10520 bytes
SHA-256: 3057a3009a5559bf41b6c04bde3b96180ab58c4237898062d7be066af1958c27
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 18764 bytes
SHA-256: 5de6a83b6fa38ac1641ab5d320451fcf53c5c0bb965f1012ecdd8ee6452eaded
font_02_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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