Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48f1eeac5f19add…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 19:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2264b22427f2b5523a1a18e5349acfbd SHA-1: 54ae8ebec53cc153b2db903d13042b352e94b394 SHA-256: a48f1eeac5f19add01ebdf67344ef55e874fa7a00cf9689b7ce42917c255a61e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs hosted on disposable domains, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pima-alarms.eu/slicice/file/34712954184.pdf In PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/28984211782.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/49301135024.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/mujaxijajarefalelamezoru.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/54628541641.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/3625046602.pdfIn PDF document text
    • http://tzsunup.com/upload/85569677366.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/81102312600.pdfIn PDF document text
    • https://rjpexport.com/files/67935374935.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/83898167347.pdfIn PDF document text
    • https://cardolf.ro/files/bekiwunoxarenurepip.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/kudafulosabagipis.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/45863240895.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/muginigisib.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614030b11402c---3616522426.pdfIn PDF document text
    • http://badgerhillfarm.uk/wiwenakazuvewevunasukef.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a2ee1d56398348c0ee5e0a485e5fe43a/leligojajowunafodale.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/74629906125.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/timibonapenigonasaf.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/foxuli.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/ginepoturirovuwi.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/8da4bb3750a6ba7b69920484727329cb/33839444881.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/2780096562.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c954259cf5f1bad3ccf5f255a97dbfe8/rimekaponorovimesewemasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+apk+free+minecraftPDF 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_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 18620 bytes
SHA-256: aa9a745c3c4b10ccddd0d8bed721337879529fd2e826fa983d7f199c242ff3c1
font_01_sfnt_off0001126b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126B 10792 bytes
SHA-256: 2233cf2fa53aea5031c5a444ecc9c4715abdd87daf7ea1efb7133481653b62ef
font_02_sfnt_off00012b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1