Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd893f836a25152…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 09:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0308be6eadd52fc7535347c0cb53187a SHA-1: b89508a9f00bdbccbf7aeece11568192cca81fcb SHA-256: 7fd893f836a25152b126271c84b4c8d012ff05832205b4aa67dccefd1e5d2091
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish for credentials. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bpabv.nl/uploadfiles/file/babokogasapud.pdf In PDF document text
    • https://zhansq.cn/upload/file/sorow.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/77755414645.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/koloponogizolasirusi.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/ludigebulizuvolax.pdfIn PDF document text
    • http://exosushi.com/uploads/files/9703061381.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210927094934.pdfIn PDF document text
    • https://siroyensao.com/upload/files/30253655968.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/bonaludogivase.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/wisabuwinanewozukidogumag.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1010a3e2a---46009454715.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/nj9fnfvaevtdf1p7hosleh2c6f/jelujubububasomegu.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/pexotunixunebesi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/99502255636.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/sinimok.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/63804293029.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6fe2b01e---muxumedewilepixozu.pdfIn PDF document text
    • http://kisito.com/userfiles/file/47792111675.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2d8a1343c66f4bde504e8814d8a67047/sofewo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4b2b22e5033900aa39a2c3ff4d8099e4/bemokimalodavoxafogakaba.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/71294792501.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/sudewuxoresemosuxebuv.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/85795640769.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/68856935781.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/fibumupusuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+you+copy+and+paste+on+a+smartphonePDF 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_off0000b2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D2 10932 bytes
SHA-256: 93539193322eda142458a47c1f34c113f7a3283925bd639e7b69fe936de82cea
font_01_sfnt_off0000cc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC04 14880 bytes
SHA-256: 248787a358343e75603707e3ba89c53a3e8a8782dff70e6ea61625ffc38e16f7
font_02_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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