Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb5fcbb545d71a2…

MALICIOUS

PDF

85.0 KB Created: 2021-08-19 21:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 175fe6422645a518ff36222260a2538b SHA-1: 654a2311b5b3348a0747fbc955a408f54b954b5f SHA-256: fdb5fcbb545d71a2900e24b8c41fdd2472a581d9fafe7982241ac940a5ccc185
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute content, and ClamAV detection confirms it as a phishing/trojan PDF. The ML classifier also strongly flagged this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=how+to+farm+exp+azur+lane PDF link annotation
    • http://tangiahoang.vn/Images_upload/files/mezutalusifadod.pdfIn PDF document text
    • https://wecareprogram.org/images/file/varonatagexodepakobojizu.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/liwuxokurasibawulitokov.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/30691858357.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/491256558465fca371181bf798b11a3d/ramudegovigen.pdfIn PDF document text
    • http://toonesk.com/upload/lofajixazivut.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608532b51e025---sosinozajisi.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/14133411782.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/jakivemarotenezilavi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083256637fbd---20473981084.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/jizajitaloxunikuf.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/92149481911.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/25506667362.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/mulinilegeseziwik.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d878683393---66449093821.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd9ea1c20---97403525238.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/15057988259.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66c9e26d7a---bowojiduleniritid.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4309e650e86045752b7b84dc4a802e69/26948261000.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/vakara.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/ziwexuzitulifibixalo.pdfIn PDF document text
    • http://flexa.cz/docs/file/fiwujilepomufiwovupip.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/44839498902.pdfIn PDF document text
    • https://riwg.in/userfiles/file/83613383047.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_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 10596 bytes
SHA-256: 7786c15a24ff755042de7feada996d37d5e1beb738c007a4d0589e072fc72ccd
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 18820 bytes
SHA-256: 1fceee75e0865e322fe7ffc4682a61262b121432c1f9164eabe49acafec2365d
font_02_sfnt_off00012cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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