Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a26ce5a00263a57…

MALICIOUS

PDF

112.9 KB Created: 2021-06-27 10:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 28933dd088ab286466f1fe8d6d3eca88 SHA-1: d768555ef25751262472510667b5d4111205336e SHA-256: 4a26ce5a00263a57de426de3c27cc23cb5909c23ec1409afacdf0ef87aa07b14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. While no scripts were explicitly extracted, the nature of the link farm suggests potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=eucharistic+adoration+meaning PDF link annotation
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b889e93e826---93361605216.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e6fb184a6---96391279641.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/14khmrki25jecamo3cp5ppp3re/dexudusasujof.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/m76a32sgq0tpsthe7o3ipg93mc/zidipimizawerapoduzevuxew.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/3071302192.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/6kruvv7jvmf4nrcuhchrd4f5ek/82400563899.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/271071ec32c75de5a1fcffc301db0052/samusiv.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ehbksfasfga2251nak4see8o14/bozipulisawigagofavulor.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/dirafaxisoginirije.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/08bvfjinth8euio74uf7i282h3/zavolonazuga.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/56485327047.pdfIn PDF document text
    • https://chp-travel.ir/data/file/duxolalomepuzowofaxis.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/lezajotamebolubomubaza.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/toguzimoriro.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/34e2474a927b8ec87a95087dccee7849/63187291776.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/lajulelidolurajewonabev.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/kifujugufinul.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/1910493678.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ln2httnv0q6jhtpl1sttqhtao3/tojolorivizolin.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3344e36df5ce34608a032281a3249e8e/29800671154.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/rigexutojonolejok.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f43b3a30---tafiwe.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/adc746ac07856a4552a4fdccbe4cf701/46806562308.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e855c7ec987ce00537a08d724794bada/12626408.pdfIn PDF document text
    • 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_off000156d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D1 18456 bytes
SHA-256: 034cd70c532780369cffbf5392f3fd132a390becb89c05eb0f2688bf7603d469
font_01_sfnt_off000185bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185BB 10852 bytes
SHA-256: f9c389856fea66709e66b561a05d2ed300e94521d19d09ca1d35c61e81249ad1
font_02_sfnt_off00019e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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