Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b59f005ecb941a…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 09:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 038ac64f1cbb7aeadd00e0fc95d7e642 SHA-1: 4a651b8c39e22b63ea0906aa79c8b83aea5d54ea SHA-256: f1b59f005ecb941a14bea6077a5d3154f27bc8bb27fe1ed832a98a84e48fb75a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, indicating an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://istanbulbalbir.com/upload/ckfinder/files/55787310767.pdf In PDF document text
    • http://studiolauramoschini.it/userfiles/files/jikarepelawawebix.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161351e80e1ac7---38918922590.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131349eea299---70587030508.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/47138694739.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/zilozubedagi.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/32788411906.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/fulerezifijetopoge.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210914file///loninozafiketuwuj.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e067fc3ef3---pewopomefuwisa.pdfIn PDF document text
    • https://magerp.org/upload/files/70191007946.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/nitekizogutokurabaxotuf.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/82915223717.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139af5cbbdc4---61249693829.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/80845137531.pdfIn PDF document text
    • https://unaizahic.com/Files/files/6888047255.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109140246183227.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/81697833346.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/98709978115.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/99855356970.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/79183526950.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/58404508259.pdfIn PDF document text
    • http://royalgroup.at/tmp/wikogo.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/46817431840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fifty+shades+movie+online+freePDF 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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 17320 bytes
SHA-256: e6a057dcb95fb97a72572a3c902dd2f99a82fa677e63ca48ec85b3afd214b126
font_01_sfnt_off00011a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 10776 bytes
SHA-256: bf09ffac860da815ff462ee8ba9fd5fee1fe870898d72994854a89daec5d4fff
font_02_sfnt_off000132d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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