Malicious PDF — malware analysis report

Static analysis result for SHA-256 561df1f99ff722bc…

MALICIOUS

PDF

118.6 KB Created: 2021-06-26 17:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1cc072d8f55e3ea4f94accc58065770d SHA-1: a78b1edb2ab7088a3e17b29f8354bcc358e96be5 SHA-256: 561df1f99ff722bcf810322f0b0d36718644ce8da4bc86e8e67e54685e6518e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160893ac591b13---54368788317.pdf In PDF document text
    • http://vds-construct.pl/userfiles/file/40079653788.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/30454626467.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/v9gj39enpgpnv91bdg676pdkp9/baribapadozejetolise.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39aa9a9d7854abd60c8cf2974e1789af/tiseduzeroputinuxuxurizam.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8086c537af76105f36368858b476e6fa/makolexulapurezoza.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/buvixa.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/takedexajexet.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/729197d82ca37be0710b61ae120f079a/rixipumaginu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/88203f987ce63375ea3fdea3dbe945e9/25567966032.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/bufolarizejulazatebudap.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/1fcb2f1dbe3a1530518ac791e352f6eb/47099725574.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/95e118c098850e881736d3e2649404f8/35642154763.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d00d8c5fe93d4160493b0da1c878ae45/karekigidonaribibezik.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/12127895185.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/pugetabokilanikosafupot.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/71730809222.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a753563f04b---4626078135.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/38913831976.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a9eaf97c---roxatuduropap.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/jobarepezabojifewakoda.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b93828c82---pumemowopogadatoruxas.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/bivamuzezewifizumidujunur.pdfIn PDF document text
    • https://baongochoa.com/upload/file/31977870956.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b114d2e6653---34561229890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=katharine+and+david+fosterPDF 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_off00016bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000183e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183E2 10460 bytes
SHA-256: 609492d31292e8c2bb7f5440e11be2f841b7f1d38d07ba25a90883b8160956fd
font_02_sfnt_off00019b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B9B 18320 bytes
SHA-256: 16d3ff7a4dc672f33e8df729bd92869134df4eb0a790c1fbb9b2610cdeb95099