Malicious PDF — malware analysis report

Static analysis result for SHA-256 df22f03ddfbb194d…

MALICIOUS

PDF

83.2 KB Created: 2021-06-27 15:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 44d676eb42cbf63ba158b52461a6669b SHA-1: fb1822fca9dfe203acd780d98a06223bfb52898b SHA-256: df22f03ddfbb194d071eecffdd97d6ad3d9e3c3714b74a55065f4d1905c2e0e1
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.2133

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://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/vatenivuxitusovumumesowa.pdf In PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bafed6daa12bc6dcce7ebd507706be52/gulusenikuz.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/jenh8a2f7uh9m1487laqumchsl/45213653289.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adaeb860a27---34618916733.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/wugomuravudigodizo.pdfIn PDF document text
    • https://unosms.us/userfiles/file/55089928795.pdfIn PDF document text
    • http://soles2walk.cz/data/file/82930923388.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bm8oc27b6g0d0mm9eq1ae11f16/xumekemozafuvepiwe.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8dd6b59f---xaxejoxizedumefadavopax.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/ecda09b15521b1eaa723cf6b120abafd/41998684573.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/92f862a791b0540958e3436be43cbd8b/banifitomitizuzusanuzufew.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/26b5b4753d54553a109b1649bfd86d9e/27158097098.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5768e47a0---wusebob.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210515202653.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/70dkso2t634bagko4pbhofkfh1/kituxosubolamupavaki.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e5a14cd3---gusumitoguxonizegivolav.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc47621b7---95677346343.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/gaduxinatoloko.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/jibasode.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/zazanuxatinuzi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b8c65eef---17711356256.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea8723b74---jevaxanakelug.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/daa066b70e2d221c4c7fc0c21b88d8a9/8908966269.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7e10414b---23453430224.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/03330fc797381f22f39ffd05349c5465/rudazosazadinago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=self+introduction+mailPDF 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_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 16720 bytes
SHA-256: 44aaeeab5d730c2bbd3514cb865ef74d4bb48a4d7081ca70c3fcd34e998f2958
font_02_sfnt_off00013459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 10644 bytes
SHA-256: 5855349dcb3340127f82636e009538805e52e0d76c94fe5835266ff4a5cfe304

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