Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf8d54a5ba441aa…

MALICIOUS

PDF

84.6 KB Created: 2021-08-13 04:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 861b6e4f2d663295d8f06c70d2ba5080 SHA-1: 2e6eeff83013c8383306f5969124f121289cd5af SHA-256: dcf8d54a5ba441aa54a3bce036417c840ed229d07c95a264050100389fe89107
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The file functions as a link farm, containing numerous embedded URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=insya+allah+sah+full+movie+2 PDF link annotation
    • http://kulturazebrak.cz/userfiles/45417604887.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/44414385407.pdfIn PDF document text
    • http://kbchina.de/upload/joxojon.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bf0c8ccaf---fewofodubopigadomoris.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/918de5200bab770e16a511daf0f51af3/78826088152.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160984bef399b5---71488580834.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/68099288101.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/44465447956.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5177aa4340---vojugidujelegatijopekupo.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/94717557882.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/9el0iml1o61qrr2hkltil5hpac/97741608824.pdfIn PDF document text
    • https://luminex.pl/upload/file/gikemedonafebikibivopi.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/adcaccd17266ed65a390a7ef6fa95ebb/78760782047.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/26535791353.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/rulugenamejenituzosuta.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ab5068ca6---96510989783.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608027b050528---91164002904.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/43365919048.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/poxovitu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ad378d95---13232703236.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/imk4uhk6s1fjfoduh0idq6gd26/41479417231.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_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 16612 bytes
SHA-256: 68fd55433b9997bb1307f8fd5d42f352a7fd91270ccee57de87209304c8932df
font_02_sfnt_off00012bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD0 10632 bytes
SHA-256: 8f72e473fbfff645671ef618957d0f5eee78df50874e5ff4a898c5a8a15124cd

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