Malicious PDF — malware analysis report

Static analysis result for SHA-256 461db8fc52ee4d07…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 12:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 387b76e39fcb15b5411e722a6be94909 SHA-1: 33771e6290193cf3b8cb7bb0313b89d5f956b59d SHA-256: 461db8fc52ee4d073f05a0e7914dba2b693485b41cb7c5292bf877e7075972f9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the document functioning as a link farm, with many URLs hosted on potentially compromised or disposable domains. The presence of multiple external URIs and link farm indicators suggests the primary purpose is to redirect users to other sites, which could be for phishing, malware distribution, or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6954

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://galluccifaibano.it/userfiles/file/41915161004.pdf In PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/topenedok.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wumofiwekosezijubopopanu.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091519112468.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/gulusuposo.pdfIn PDF document text
    • https://jck.ro/userfiles/file/96867801725.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/pisj99u93bbfeomr5vhedkfbt1/97271898847.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/24073188383.pdfIn PDF document text
    • http://showdoimovel.com/files/files/raxumogotewowedakatax.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/wepokofijiz.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/famut.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202192648485413.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/di3cc4cuoamhebcdb5fmsahucu/lujenisaxeludezogafinib.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0b4c2a3ec---30815117164.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/lajomixeset.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/risoxag.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/ruzatekolomesuseki.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16134bc72a7c2a---gamopuzimekabozi.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/kojewizusozazi.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/pulogimekikovigaganalawe.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89860fb06---74905259834.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/zawinolik.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/72333557467.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/7411904191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+rom+installer+tool+for+pcPDF link annotation
    • 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_off0000bcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC0 10760 bytes
SHA-256: 7a626d636c02f131af024d431fe0687c27aa43a09ef5baa1c4fd52b0b101fad8
font_01_sfnt_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 17104 bytes
SHA-256: 7d7620919210efbb57a075384b4d3733dc0ac7470dfe56a5f61c5653a1c9b0ff