Malicious PDF — malware analysis report

Static analysis result for SHA-256 065c8944e1862080…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 22:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7b2e0c139c412322a514e3e3d94d84e1 SHA-1: a8f5b567b46c5b3b2436847cff18c202daa918f8 SHA-256: 065c8944e1862080157e7a31860c201e4cf063fb57bf45fc5ea89ec0de40752a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=cast+of+sisters PDF link annotation
    • https://smartech.lv/sites/smartech/uploads/documents/files/97440065940.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/bisexadenixivig.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/6027604284.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/42274107905.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/52242971263.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b73f93182---67362540163.pdfIn PDF document text
    • https://cecprint.com/images/file/lokat.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161407381b4757---39583801988.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/5291958971.pdfIn PDF document text
    • http://archbot.pl/files/file/tizenozikalanaw.pdfIn PDF document text
    • http://allycatering.com/userfiles/57861649210.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-11/20210911185755805174.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/29799577280.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/divujexo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5fca67585eae7863b1fdbb150ab7645f/46188569594.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/24380784044.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///93027356634.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/50056270675.pdfIn PDF document text
    • http://digifast.cz/userfiles/58458147890.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/farigidotoro.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/venilosipemunen.pdfIn PDF document text
    • http://fohow77.ru/upload/file/lupekumisewuzanosalusitul.pdfIn PDF document text
    • http://orderkai.com/uploads/files/litinopofexurodujofelove.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_off0000b197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 16068 bytes
SHA-256: afd311795cf8d2a1ff4a44c3a78b08083cb2e015ed291e057df677b9a795aa32
font_01_sfnt_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 10088 bytes
SHA-256: 6dd6aff50feb6447b46dd8b4fe8adf5f2f3798978e6b6fe099dd44e559215b27
font_02_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1