Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad97fe83d33636af…

MALICIOUS

PDF

97.1 KB Created: 2021-09-07 23:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b1aca32ee4ece3fdd5c3447a4a718cc0 SHA-1: 01c6ca81dd4d7cda9d19d169a169a92dd42205b0 SHA-256: ad97fe83d33636afa9829499dbd2d88bc2c2e76f67cca36d066ed0e7f2894438
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ancoraeducacion.com/images/fubixat.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8359467b31c4755093a8098585c9d3ed/94340400150.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/96441738345.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/jajeb.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/wirafonojoluxamazolo.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/93722973344.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7dspbg9cq73mqgu0ri0tjuv252/74275568140.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/58597017139.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/wepurefetu.pdfIn PDF document text
    • https://signika.pl/Upload/file/92931971571.pdfIn PDF document text
    • http://storemisr.com/uploads/files/74221494351.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/32983769121.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/65359759553.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/44282367263.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/044f54bed2d57e72bad2519b9a36601f/pizodugot.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/1847745751.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160848d5e60843---61668151945.pdfIn PDF document text
    • http://belovosushi.ru/files/94141157315.pdfIn PDF document text
    • http://parfumland.sk/upl/modilubujoteve.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/81509189918.pdfIn PDF document text
    • http://salt17.com/userfiles/files/jirupofokor.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/96792414095.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6d2d3d5acdca8e197ffb99ad61d7d9ae/15364049923.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/kagolexami.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/65cd478fb79f36c653e76679e9fb2aed/11857067427.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/44qamomf27c75grvqe9lvg82ek/nevalen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ts+constable+prelims+question+paper+2018+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_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 20496 bytes
SHA-256: 0ec3dd24ff68a398ff786463e1d9cf06b933284d4449e2772d86032ed8abca16
font_01_sfnt_off000142dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DC 11632 bytes
SHA-256: 0cde9d0bdade65ab4a24df76faf8c97c7793362bbc693d9eea829d02a7700696
font_02_sfnt_off00015e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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