Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda8d000d21e41d2…

MALICIOUS

PDF

98.6 KB Created: 2021-08-24 12:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1448b438d54d7c67f319459d8d2c8be3 SHA-1: 0eb647078dbec2bdb916132033b3731ccd325b40 SHA-256: fda8d000d21e41d2a9025fd91837782576c9f7928f3d782ec837da27ca5c5000
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=desiccated+meaning+in+english PDF link annotation
    • http://pc580.cn/upload_fck/file/2021-8-15/20210815211524911985.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c074b4a0dc0---botogaponopafuwepafinotib.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d838e0d2bd---39394138898.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/76651408481.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8b2ddbe8---mefowovalediwokax.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/3239421468.pdfIn PDF document text
    • https://nevisnews.com/userfiles/80882310942.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160976b477f464---33208806165.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/juletabovode.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///53797304020.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/19305444606.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add45d9cdbf---90339651955.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/7841268215.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/44b19009a38ba4a78f48192502cb0b05/ligix.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/8fcgc5evds4fpkpg3lfnmaag6n/pamidurobeput.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hvhqo3of42u6pp29qan3hftkf6/41257981585.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97876225424.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/71022279096.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081898d27145---kiwiwubaxavodoneladepa.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8g87r768q02scipsos1m29430f/87025966319.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/sivorirujunexanati.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079db58b6912---bojujitobugegiwawegen.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/21838ce24bea5c1cd3cbbdfbda24a3c3/fediwufejegegujesix.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/gejitadelivove.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/67438997982.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 23468 bytes
SHA-256: 481a424756fdc6a2cb651658b1d71c7bae35200fad8762c29713ffa8f8637802
font_01_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 16824 bytes
SHA-256: 5140a689dd25388fabf09c330e2b01080a1d4d3e8ad612d97cfe9be72a75459b
font_02_sfnt_off00013e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15682 10596 bytes
SHA-256: 5c0ef454f0566b248d7d5f390f8b993787449507c61b64b1dd3ce14376662e28
font_04_sfnt_off00016e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E48 2616 bytes
SHA-256: dc976919b7e61caa4740cc2919962d71c98a9d6b28ea3728ec2b8ac8f2d08c3d

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