Malicious PDF — malware analysis report

Static analysis result for SHA-256 49db774be5e77db0…

MALICIOUS

PDF

90.1 KB Created: 2021-07-29 20:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 175cdd53d45c8c8b013e6b573e9f10be SHA-1: 83f4b547b7f59270fb3836d905b65298675c4c7d SHA-256: 49db774be5e77db0551b9d0b23abeeac538b38c9ed892539b57dedd2a6ea9288
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself is also flagged for duplicate object bodies, a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://eros-arena-reutlingen.de/eros/userfiles/file/moluvopujekumun.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/959e799d576e9c3823a118459685b852/tikazejoniduwilaxaxu.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/12664607598.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c12db775---58538798985.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f2affa2130ad539e62951a509787caed/rasudefegizuxiw.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2201bcb5fd---73422508110.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/wojolusafudojaned.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093cdaf2673c---pitizogatodekunusogadute.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b1bc9728ecffdf5be838dc7bb2a8ad5b/77213223304.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/32175433126.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/48398342343.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/79223242324.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1a5ec9db2---pikumavo.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/tisejemiromubi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf37a726a2---musoreka.pdfIn PDF document text
    • http://twilaw.com/files/files/rilisogumanatorikoxubano.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f76dfafd8c1c5589dec672d5267d7f04/47515194450.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/1021538589.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/76473966929.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/munosegew.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74ee13cee---32128159088.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/zuwokafogi.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d0d7bdedc76d42b07de848b74f523155/figonaxupimekekobi.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210613191101.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rqenosqorcms18ihkfqgpq5430/zosuwobexuvokofusesa.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ecb34965445395f03f4fb2a63921be5f/lokejumulezopil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=unidad+3+leccion+2+grammar+1+quiz+answersPDF 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_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 18080 bytes
SHA-256: d1d927e9025a93370e1d0bb36c6cd46006a6f6d4bffb8a3b565246c8896597a9
font_01_sfnt_off00012714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2B 11360 bytes
SHA-256: 9df573894d661dfe8c8e3621fa45697773d5348623b2e3798918130ece12552c