Malicious PDF — malware analysis report

Static analysis result for SHA-256 273cf15812a38a83…

MALICIOUS

PDF

89.3 KB Created: 2021-06-25 18:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12bf6692dbce99b48573f9ad8aa4ead6 SHA-1: 1af3e6776a15889feff4b4209c797fe32992907c SHA-256: 273cf15812a38a83357cf96b34c6bd1637bc25ff5b41abe8bd430779140900a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=pg+diploma+in+nutrition
    • http://ecohort.com/userfiles/files/73034661979.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a00b45f6d0b2d8609f80abdfd88cb5ec/33951826476.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/sobalasoxijej.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/56723056718.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c40c90d2ef---xovaxudikeruzakimovalesi.pdf
    • http://pixel-pro.ru/upload/file/wudupole.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6187b28be0a97e9ffd39373ba9ccc993/nabeda.pdf
    • http://thedewakohchang.com/image/upload/File/8154175839.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93806c983---guxepo.pdf
    • http://belgium-ex.com/images/blog//file/75720866259.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/q6bv5shvv1454egbqk62pdf4k3/fagimozazokejevise.pdf
    • https://actor-conseil.com/files/file/47175089360.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/v7dt71ib4tda9uu6ibda7l11dn/nibozoroguwevoza.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160827718ed4ce---popevemifowowezij.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/p9kfq28qkhkqf3c2o5pvef758k/jifesizipojosetuf.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/m2jr1c4ip842ejsltkdluvc7in/95176308127.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe4ec2d61---dogirorefatebiduzutiw.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/i2bveps3q1dl7qpresc9cestf5/mekidurumagurikat.pdf
    • http://lapenya.cat/imgjovesnaves/file/sovenojefunawakawulage.pdf
    • http://fructusartis.com/i/File/8095499471.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/282ab4264e3268388d91a687ea539d16/wowigajubunem.pdf
    • http://szpk.hu/_user/file/30983744306.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/00639116e5171635283872bdfe68a563/5416346264.pdf
    • http://rbtyutj01.com/userfiles/files/wozapap.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/7a3e86c442b21c21a875948970eaf721/17520429208.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/7767209a2c9345e45ec26e8aa0560c72/23256083717.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/gtvtd2ea0ln7ur897odoeri610/tumamikapajasuxone.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b9eb1f720---89830049443.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac1.bin
2e2dac92f18e2785e4cfa614a416e08d1ece66193ac006316219aaf00e29b4fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 17320 bytes
font_01_sfnt_off0001282e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 16792 bytes
font_02_sfnt_off00014045.bin
6d5582159fcb312a50321b1183d93af91e9eb04ed83ae7c2c782c977124d5573
pdf-font-stream PDF embedded font (sfnt) at offset 0x14045 10536 bytes