Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9a7d9205adf532…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 01:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 408941c40d5ae265f0bfd5c784dc1c75 SHA-1: e9f258eb3e37a1fc91bebd3029000a77d7d2c25d SHA-256: 5d9a7d9205adf532d648937bf166f258c621c956a6861d7892704e4a7ea958c0
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs are present, some pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to contain metadata from wkhtmltopdf, but no direct instructions or lures are readable.

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 https://philabc.ru/uplcv?utm_term=free+cleanmymac+x+license PDF link annotation
    • http://nwatchonline.net/userfiles/file/fozedurifulib.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/6724059041.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/47849803524.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/jejobekenonekobisuwamapa.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/42804332498.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/55801628563.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/58952250818.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/gidezunumobir.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/35247150450.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/pukodopofozu.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/20886901324.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210917_E6717A95A825EE6E.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/pisavaririvixadu.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/vawajojimonesisov.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/56926606096.pdfIn PDF document text
    • https://ikansambel.com/contents/files/sutes.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/14392863222.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1aadfdb7---12700844487.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/32630794240.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408be9753da---15808493116.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/78610228859.pdfIn PDF document text
    • http://reflita.lt/uploads/files/goxalax.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/kambgfd8luf9m8aep04hlbefn0/83383944620.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/beganepisuvukujuxosufuga.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6baf8161d62732a017f0b0dd2c755909/9398985059.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/28239438269.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/fezobalulimuluxuxuvunebef.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613881c03be9c---gerasujozubowosajuxovad.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_off0000c676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC676 16972 bytes
SHA-256: 49f092f6d6fdc577c9670e8e8afd651de5d53f02fd4eb935dea6629e1812cfcd
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 10368 bytes
SHA-256: 59ed07538eaf2192d4d49d693e06735daf922a131e18ce7d43244737805e3f7f
font_02_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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