Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae54e12e613dc0ca…

MALICIOUS

PDF

92.1 KB Created: 2021-08-04 18:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 09ed1cc5b74d48eea4a1c4a10c4e07d7 SHA-1: df21ea7ad4247fe7a7ac6e9b374268cdbbc30d31 SHA-256: ae54e12e613dc0ca31d00d8d0efc7ffff699be51ec0814b52f53ca6f167c7ebd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, identified by the 'formcraft' or 'super-forms' plugin paths. These links are likely intended to manipulate search engine rankings or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d874dc98b5---lolujagexevizexivob.pdf In PDF document text
    • https://soechi.com/userfiles/file/10879944834.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160896dfebb8e5---56218035850.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/2263673735.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c934d7757---35634635493.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1de8276f1---14600401803.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/08b3da06b41750dfaf6351463f83b4ca/62348522348.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/fagalowulovogufefosusiko.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/81136170150.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8sose6fldi4oh8vg3mt1i0ipo4/38735164942.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/vusuwozugavigix.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/58301770032.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/65619892808.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095d1fae1395---pozasozuk.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607474d9a5996---kebuwivimo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ndaes4b2lo4j2qjcgche0lj7v0/vinomuxapafazabolosomew.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb27da343d1---fakezixatin.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/57820241989.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7133d913ed80b363d270e15e8ba6c3f8/52504618456.pdfIn PDF document text
    • https://citronel.com/userfiles/files/90427818434.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609406062d78c---leposazegudobumeturegopam.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/28587528404.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160df765db66d7---25226130239.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160872d814723f---kasanefisigojadabelaxesa.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/kepetesenujuwupunapere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+many+carbs+are+in+dried+banana+chipsPDF 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_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 17116 bytes
SHA-256: 8edef75b845887b2af0453cc8217ba6d12e4d2d4adf3639be1bbfa9ae41aa2d9
font_02_sfnt_off0001481a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481A 10968 bytes
SHA-256: 34844f914f82c5e9b72f546d93f528381d1663c3eebc706ff3b9a9b813353131