Malicious PDF — malware analysis report

Static analysis result for SHA-256 35493c953f7fad2c…

MALICIOUS

PDF

155.3 KB Created: 2021-09-12 18:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3fb88c35a378720745fc11820618051d SHA-1: 16ea8ca297bc521f262b21adc292f1f48672d5af SHA-256: 35493c953f7fad2c83cb045abbb617f51f18346c3648e439472442fdf56af948
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content or visiting phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://aquatherm-graz.at/files/90263946365.pdf In PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/vojagutufabarapuwuxakija.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/muwuwoboduvi.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/xugorokupejexubiveritewiv.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/94336757461.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/goxazegirazaruzorefe.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///zoropozuguwu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fded730a5004767ff1cbbc45edba2e2/jimamap.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139dd94a758d---68884663946.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/sibikewo.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/tapabeko.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/47655038502.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/98320613058.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/wiselano.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/navivikipebokuk.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/takike.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/64019812353.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/99851503284.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e0b6431d805af70566dad30f89b2340f/nukupoxijozam.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/1466972940.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/12515680885.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/88629145827.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090722204673499.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/memerarumelen.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/63128803423.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lobepeloxowawutomalebire.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/biviruwib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=final+fantasy+7+strategy+guide+pdfPDF 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_off0001f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F122 10796 bytes
SHA-256: 242ce981430ca331babcf1e93871d1c3c09f54b5eed7fd6f522275c9fd5e8854
font_01_sfnt_off000209fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2220F 23248 bytes
SHA-256: 1e6e5d471ec60b9da425fdf037658b55a807844b847610d6704214e2b2274508

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