Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d048275c1819bb1…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 13:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b595d556f78c6e41dfa6958c29a85871 SHA-1: 678c791ff46ebf233b8347c094b4de9ce4a3be2d SHA-256: 1d048275c1819bb1269a316b97e20a09bdb0017b3765a5d84c432a16588dae4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to compromised websites, including those leveraging WordPress plugins for file uploads. The ML classifier also flagged it with high confidence. The primary attack pattern appears to be a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://garglob.ru/uplcv?utm_term=sing+sing+sing+clarinet+pdf PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fca47e59a---29052012325.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/55281290624.pdfIn PDF document text
    • https://heyratacademy.ir/file/29242919021.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/mofuxekula.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/savananekokix.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b67b16f4a---tobumetipu.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/33160798726.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/3428272158.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd4567744---30891102641.pdfIn PDF document text
    • https://poker-fire.de/file/44977584927.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf27edbd94---kimub.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca7ca1da9---63285851263.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40c1ec953a---9001390460.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac379c05fd9---42238992520.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/babozasa.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60f3dcd38---96483641442.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/fopovakatiwetobot.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/91766940599.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/8460172779.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/148802fabbcebc0bfbba73d0ea7bf096/timesilopo.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/gawaxeruweja.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c86dcfaf57b---bolekisijigaxatigexupitu.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/fitijumalowatokunuzu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160856ef0eaf22---pikukudewuzifarefipuru.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/3339330401.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba71c1bf131---xedugezixo.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/88238712735.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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 19212 bytes
SHA-256: 727d825699f58ea47f7f3eb30e564635becaed23a1d703121fe05b872f3482be
font_01_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 10752 bytes
SHA-256: 91d95da6ce435bed6689bbc0307f848047f3cb38eab3d8013a27defa4d5ccda0
font_02_sfnt_off00013616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1