Malicious PDF — malware analysis report

Static analysis result for SHA-256 53914025e4960ec8…

MALICIOUS

PDF

83.3 KB Created: 2021-07-02 06:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0ce0c5cd18c81bfa957e11d6f016487 SHA-1: 5affb6f7a6ccbb3bd7b2624a1fd4c52d179544c7 SHA-256: 53914025e4960ec8f26a6373f554f59f137145ce1a4b4655a631122de823a76d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML and ClamAV, and exhibits characteristics of a link farm designed to redirect users to potentially compromised websites. The embedded URLs, such as 'https://laborke.ru/uplcv?utm_term=king+george+county+weather', are likely part of a phishing or scam campaign, attempting to exploit search terms to appear legitimate. No scripts were extracted, but the PDF structure and numerous external links indicate a primary function of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=king+george+county+weather
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d211696a115---polazarivatekonamod.pdf
    • http://kfbi.ru/content/file/14717775841.pdf
    • https://local-atlas.ru/userfiles/files/pamevisakiwovu.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jo2clalioolro126ltkdre5t08/82900093655.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d11a365fa---vedogipavefijut.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/n48ffk969qfi8lcih46ogc44k6/tuguzamoxaxabufapemasuzo.pdf
    • https://ka-base.no/images_content/file/42352180062.pdf
    • http://ajivikafinance.com/userfiles/file/duzarusanitofejad.pdf
    • http://writtenmail.com/upload_images/file/45519778634.pdf
    • https://betenenergy.com/sites/default/files/file/16630176583.pdf
    • http://lycee-elm.org/userfiles/file/79412675615.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0497bcf13ba27945eeb2e75336f90a40/76386219947.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/52518277433.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebed94011c---ziwojube.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e213caca35cddb0ccfbd8ba841cc3fc/62184282782.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/webonegunepiboxovinapaj.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1233c0b666a1c72e5970ef5993e19b7f/motituwuf.pdf
    • https://kidneystonetreatment.in/userfiles/files/geponasobajixivapunudet.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e8cf8907a7d293f0577550a82337ff32/73197296025.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f160671b13---46550975472.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bqkc2vkrsgq3gdn0plh534itsi/76523225342.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6kjv6leqlg96u05a4j676d60v9/38817597691.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb225834c37---mipifazinedoxilebubi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e272.bin
9221985478299b71216d53fcbf4e8ab3dd366167a44a7c2a84d41fa9f8717fd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 17208 bytes
font_01_sfnt_off00010fc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 16792 bytes
font_02_sfnt_off000127dc.bin
0689e780a0db8846ca7da324fe4dc0c25d0fdc62f8acec3757c7a76762e83283
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 10588 bytes