Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0f1f1177464f82…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 15:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7821049b10c8a361a87b633d6d613695 SHA-1: 454d0a5bff47162c112ec0db153302eafbfa90ae SHA-256: de0f1f1177464f8243dfd08599c5f4689e611510b120637339eecd33d4fb9a37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, with numerous embedded URLs. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/fapiwilobabaki.pdf In PDF document text
    • http://xaydunglenguyen.vn/upload/files/800deb.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161448dedc6661---nodoxaniwo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hs92f0v80agt5vp9ugo6md0eg2/domewivabituvunisen.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/272af9rigf0c2sq5heq11lkkm0/34843193750.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/82633156027.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/69371411606.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/om2avssnqesdbp998skvt3r4q6/2388025827.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f94ea8ff---25042794970.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/jumepevevap.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/mubidul.pdfIn PDF document text
    • http://botroul.be/uploads/51862133071.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161369542cfe5b---podiduxibajazinujokabik.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/26363445869.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134d817668ca---60325640354.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/rulafose.pdfIn PDF document text
    • https://thepainter.asia/upload/files/pegipugebevanif.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/betenipezesif.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/pawaxepawibavosamebaga.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/xeral.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/digirugewosinemorazezabow.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e2ed9aaf8---14512463955.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/nesojojenuradad.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/73462924866.pdfIn PDF document text
    • http://bastola.org/userfiles/file/bumodezoforazebi.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/wofivijigubelokosotabijab.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/bexuxavosanorogimizatej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=delia+smith+quick+christmas+cakePDF 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_off0000c2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 16552 bytes
SHA-256: 5a340293f0e17c5079d53521caa8fd28b82c326580b288b3a60fe968e3fcb6d8
font_02_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 10612 bytes
SHA-256: ff6ba6722b01b4922212c796e72c0d9386178be030e62f8e39c48f327a233b7f

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