Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa577553e1833356…

MALICIOUS

PDF

73.6 KB Created: 2021-09-15 10:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35b29c35dbc309613d6051752481d407 SHA-1: 8f55e67fc750e61b48db4a6022387a651aa575ea SHA-256: aa577553e183335680c07cf98db9ad021d001a0121358dbbd612344abdfd48e4
196 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised or disposable domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, with specific URLs identified as potential IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 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://haokunchem.cn/upload/files/53005497296.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141471da4bbb---30607355022.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/guluda.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/85661744172.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/mutibewenigoze.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4c35e40536fdfe3761faa82bbc81c17b/62773389097.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/47028158643.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174a0a8af6---fuxebovemeresoxugegavod.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/kavuzawerewomefudujafu.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/22082323133.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/lukuwoko.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/tozitapenotitogolapip.pdfIn PDF document text
    • https://megashina24.ru/files/files/zizubadimatasiparekovonek.pdfIn PDF document text
    • http://clingac.com/d/files/lamunenakanaminedapigul.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/xumebikinuwudu.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/tupiladok.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/bifakug.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/6243474743.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/zigazowaj.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/41452253190.pdfIn PDF document text
    • https://mimpishio.com/contents/files/44952022934.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/mimewutu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310de9de90e---xajagufeliwibep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=electrical+engineering+technical+report+example+pdfPDF 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_off0000bbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE1 10984 bytes
SHA-256: 7b151119190d1c0e607ad1de371bd9b471e21a701e3897394415c62b394bdf8f
font_01_sfnt_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 16768 bytes
SHA-256: 340db59303b58ea36c99619a82411661726ad49f4ffbb38567ab77d0eabf332a
font_02_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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